Andmebaasi logo
 

2022, Vol. 33, No. 1

Selle kollektsiooni püsiv URIhttp://hdl.handle.net/10492/7711

Sirvi

Viimati lisatud

Nüüd näidatakse 1 - 20 24
  • Kirje
    The model for random packaging of small-seeded crops’ seeds in the reservoir of selection seeders sowing unit
    (Estonian Academic Agricultural Society, 2022) Yaropud, Vitalii; Honcharuk, Inna; Datsiuk, Dmytro; Aliiev, Elchyn
    The sowing unit is one of the most important working bodies of the drill. It is used to select from the total mass of a certain number of seeds and the formation of their output flow with the specified parameters. Therefore, the advantages and disadvantages of seeders, in terms of the quality of seed distribution in a row and general in the sown field, are mainly determined by the work of sowing machines. The research was carried out to develop a model of random packing of seeds of small-seeded crops in the tank of the sowing apparatus of the selection drill. The research was conducted based on numerical simulation in the software package of the CAE-system Simcenter STAR-CCM +. Because of research, the mathematical model of casual packing of seeds of small-seeded cultures in the capacity of the sowing device of a selection seeder is developed that allowed defining the equation of regression of its density from the effective diameter of seeds and coefficient of variation of this diameter. As a result of research of process of work of the batcher of the sowing device of a selection seeder regularity of change of its throughput from an angle of inclination of a gate, type of a form of executions (triangle, semicircle, rectangle) in the form of a polynomial of the third degree are received. It is established that the choice of the triangular shape of the dispenser allows for ensuring the highest accuracy of seed dosing.
  • Kirje
    Changes in the nitrogen compound transformation processes of typical chernozem depending on the tillage systems and fertilizers
    (Estonian Academic Agricultural Society, 2022) Tsyuk, Oleksiy; Tkachenko, Mykola; Butenko, Andrii; Mishchenko, Yurii; Kondratiuk, Iryna; Litvinov, Dmytro; Tsiuk, Yuliia; Sleptsov, Yurii
    The analysis of efficiency’s research of interrelation between soil’s biomass and tillage systems and fertilizers is done. The number of microorganisms responsible for the transformation of nitrogen compounds and their state in typical black soil was studied. There is evidence-based scientific and practical research on the effectiveness of these microbiological processes and the improvement of environmental performance through the various fertilizer systems and soil tillage. The use of an organic-mineral fertilizer system increases the total number of soil microorganisms and exponential mobilization processes, compared to the variant without fertilizers. This pattern is clear in the variants of shelf tillage for row crop rotation. The number of microorganisms that absorb mineral compounds of nitrogen decreased by 24%, bacteria ammonification by 1.5–5.7% compared to plough tillage. The ratio between the number of microorganisms accounted for the nutrient laboratory solutions for organic-mineral fertilizer system, compared to variants without fertilizers, is greater by 20–26% for differentiated and 14–35% for shallow tillage.
  • Kirje
    Economic efficiency of sweet corn growing with nutrition optimization
    (Estonian Academic Agricultural Society, 2022) Hryhoriv, Yaroslava; Nechyporenko, Valentyna; Butenko, Andrii; Lyshenko, Margarita; Kozak, Maksym; Onopriienko, Iryna; Shumkova, Olena; Shumkova, Viktoriia; Kriuchko, Lyudmyla
    The efficiency of sweet corn production for grain has been studied; economic advantages of cultivation in comparison with other crops have been highlighted. The article presents the results of research on issues of improving the economic efficiency of technology elements for growing sweet corn of the variety Moreland F1 under conditions of Precarpathians of Ukraine. Taking into account the production strategy, have been outlined cost-effective resource-saving and intensive technologies which provide the stable yielding capacity of early-ripening hybrid of sweet corn under conditions of Precarpathians at the level of 4.99–6.65 t ha–1 accordingly with the profit of 370–500 € ha–1 and grain production profitability 112–135%. It is established that under the conditions of application of mineral fertilizers at the dose of N135P90K125 + N60 + N30 in two stages the grain yield of corn increases compared to the absolute control (by 2.26 t ha–1, or 30.3%) with increasing costs per 1 ha of sown area 68.23 €, or 26.4%). In proportion to the increase in yield, the amount of profit, which is 192.42 € ha–1, also increased significantly.
  • Kirje
    Research of mechanized process of organic waste composting
    (Estonian Academic Agricultural Society, 2022) Aliiev, Elchyn; Pavlenko, Sergey; Golub, Gennadii; Bielka, Olena
    The article is devoted to mechanising composting based on energy-saving technical systems. The goal of the research is to determine the patterns that describe the impact of different drum-blade working bodies' design and technological parameters on their work energy performance, the homogeneity of the mixture components distribution and their structure in the formed composting pad of a certain height. The physical-mathematical model of the mechanized composting process of organic raw materials from agroecosystems by technical equipment with drum-blade working bodies has been theoretically substantiated and experimentally investigated. There has been developed the mathematical model that correlates the value of the mixing quality variation coefficient with the load factor and the kinematic indicator of the operating mode. It has been established that, if provided the composting pad layer height is the same, the use of a double-drum working body is more rational in terms of power loss in comparison with a single-drum one.
  • Kirje
    Effect of humic acids and the amount of mineral fertilizer on some characteristics of saline soil, growth and yield of broccoli plant under salt stress conditions
    (Estonian Academic Agricultural Society, 2022) Al-Falahi, Muneer N. A.; Al-Dulaimi, Kamal H.; Ghani, Emad Telfah Abdel; Al-Taey, Duraid K. A.; Farhan, Khaleel J.
    A pots experiment was undertaken to determine the combined effect of humic acids and mineral fertilizer on some characteristics of saline soil, growth, and yield components of broccoli. The experiment was conducted in a randomized complete block design with three replications. The first factor consists of two levels of humic acids, namely without humic acid (H0 = 0.00 g L–1 ) and humic acid application (H1 = 0.35 g L–1 ), while the second factor included nine fertilizer (92 kg N ha –1 , 200 kg P2O5 ha–1 , 150 kg K2O ha–1 ) application rates that were (100, 100, 100%), (120, 120, 120%), (120, 120, 100%), (80, 120, 120%), (100, 100, 120%), (80.100, 100%), (120, 80, 80%), (100, 80, 80%), (80, 80, 80%) which added as a percentage of original fertilizer recommendation taking the symbols of R1 to R9 respectively. The treatment R1 was designated as a control treatment. The results indicated that humic acid application (H1) and increasing the amount of applied mineral fertilizer (R2) reduced the hydraulic conductivity of the soil for different soil depths. Humic acid addition (H1) increased concentrations of calcium and magnesium while reducing sodium concentration compared to control (H0). Contrary to humic acid, increasing the supplied mineral fertilizer led to a reduction in concentrations of calcium and magnesium while increasing sodium concentration in the soil. The sodium adsorption in soil particles in the ground was decreased due to humic acid application while improving the mineral fertilizer. Humic acid (H1) combined with increasing the amount of chemical fertilizer (R2) gave the desirable results in decreasing the sulphate, chloride and bicarbonate in the soil profile. The addition of humic acid (H1) and increasing mineral fertilizer application (R2) led to a significant increase in plant height, leaf area and head weight of broccoli per plant. Similarly, the interaction between humic acids and chemical fertilizers (H1R2) led to a significant increase in plant height, leaf area and head weight of broccoli per plant.
  • Kirje
    Carcass characteristics and meat quality of broiler chickens fed dietary white and cayenne pepper powders as additives
    (Estonian Academic Agricultural Society, 2022) Adegoke, Adeola; Sanwo, Kehinde; Egbeyale, Lawrence; Abatan, Munirat; Oluwasinmi, Modupe; Adebesin, Oluwaseun; Williams, Oluwaseun; Adeola Adegoke [0000-0002-5973-3175]
    A study was conducted to investigate the influence of dietary white pepper (wp) and cayenne pepper (cp) powders fed as additives on carcass characteristics and meat quality of broiler chickens. Fifty-six broiler chickens (two per replicate) were slaughtered (each close to average weight per replicate) from a total of 336 randomly allotted chickens given seven diets each apportioned to four replicates. Data obtained were subjected to a One-way Analysis of Variance with significant means separated at P <0.05. Results obtained reveal larger dressed and breast weights, as well as meat + skin:bone ratio was recorded among chickens fed addition of 200 g of cayenne pepper to the Control diet (C) (C+200cp). Notably, only chickens fed C+200wp and C+125wp+125cp diets had meat containing palmitoleic fatty acid; though the latter (1.28) had higher (P <0.05) linoleic than C+100wp+100cp (0.67). On the contrary, feeding C+125wp+125cp diet resulted in numerically least meat Index of Atherogenicity (IA) (0.49). Meat lipid cholesterol profile was preferred (P <0.05) in the meat of chickens fed C+200wp diet, though identical (P <0.05) to C+250wp diet. Feeding C+125wp+125cp diet resulted in a low (P <0.05) meat superoxide dismutase value (89.23). This study has shown that to gain a larger yield, C+200cp diet should be fed to chickens. Palmitoleic acid – a rare fatty acid occasionally consumed in Western diets was found only in the meat of chickens fed C+200wp and C+125wp+125cp diets, but for an overall balanced fatty acid profile - hazily depicted by Index of Atherogenicity, C+125wp+125cp diet is suggested as it indicates the impact of stress was minimized. Meat endogenous antioxidant profile reveals stress imposed on chickens in C+125wp+125cp group was lowered by antioxidant fed – a significance to poultry farmers.
  • Kirje
    Relationship between Zn and Cd in soil and plant
    (Estonian Academic Agricultural Society, 2022) Aljumaily, Mijbil Mohammad; Al-Hamandi, Hudhaifa Maan; Farhan, Mohammed Jarullah; Kareem, Hiba Abdullah; Hudhaifa Maan Al-Hamandi [0000-0002-9222-8517]
    The relationship between Zn and Cd uptake by plants is somewhat controversial according to the lack of information about this subject. The objective of this study was to increase our scientific understanding of soil about plant factors controlling Zn and Cd bioavailability and uptake. This experiment was carried out in the winter season of 2019. It aimed to solve the mystery of the Zn and Cd relationship in soil and plant uptake. Five plant species were under observation (carrot – Daucus carota, radish – Raphanus sativus, wheat – Triticum aestivum L., lettuce – Lactuca sativa and bean – Vicia faba). Plants were planted in plastic pots containing 2 kg sandy loam soil with duplicate and exposure to six Zn:Cd ratios (1:0.5, 1:1, 2:1, 3:1, 4:1 and 5:1) with increasing elements molar ratio of Zn to Cd in soil. After 45 days, plants were harvested. Zn and Cd were determined in roots and shoots. Results showed, that at low molar ratios of Zn:Cd in soil, the relationship between these metals in soil is almost synergistic and both elements are accumulated easily in plant tissues, but at high molar ratios, the relationship between these metals is almost antagonistic where Cd be more competitive to Zn uptake by plants. It was concluded that the 2:1 Zn:Cd ratio in the soil is the border between synergistic and antagonistic relationships.
  • Kirje
    Earthworms (Oligochaeta: Lumbricidae) and heavy metals: content and bioaccumulation in the body
    (Estonian Academic Agricultural Society, 2022) Kokhia, Mzia; Lortkipanidze, Manana; Gorgadze, Oleg; Kuchava, Madona; Nebieridze, David; Mzia Kokhia [0000-0002-9654-7670]
    Nowadays, when one of the most significant problems for mankind is saving the soil from pollution. It is well-known that one of the most important means of soil rehabilitation and remediation are soil inhabitants, their biodiversity and products of their life activity. Given the significant role of soil inhabitants in soil formation processes, it is important to consider their role in the processes of reprocessing and bioaccumulation of heavy metals. That especially concerns the earthworms, whose role in soil formation and maintenance of natural fertility is well-known and causes the interest of soil scientists and ecologists. The paper shows the degree of bioaccumulation of heavy metals (copper, zinc and lead) in the body of earthworms. Study involved three species of earthworms, which were collected in the vicinity of Tbilisi – Aporrectodea rosea (Savigny, 1826), Eisenia veneta (Rosa, 1886) and Allolobophora chlorotica (Savigny, 1826) – showed that earthworms of different species accumulate different amounts of heavy metals – copper, zinc and lead and, depending on the species, after being placed in heavy metals solutions, they demonstrate the different intensity of movement. The amount of heavy metals in the body of an earthworm depends on the structure of the body tissues and maybe on the structure of the skin- muscular sac.
  • Kirje
    The effect of superabsorbent and different rates of the local fertilizer on garlic productivity in the forest-steppe of Ukraine
    (Estonian Academic Agricultural Society, 2022) Yatsenko, Viacheslav; Poltoretskyi, Serhii; Mostoviak, Ivan; Vorobiova, Nataliia; Lazariev, Oleh; Kravchenko, Vitalii
    This study aimed to determine the effect of different rates of topical fertilizers on the background of superabsorbent polymers (absorbents; SAP) on plant growth, pigments content in leaves and activity of antioxidant enzymes in leaves and soil, yield and nutritional value of products. For this purpose, an absorbent at the rate of 15 kg ha–1 and fertilizers were applied, spread on the soil surface 100% (control), and locally in the furrows when planting at the rate of 25, 50, 75, and 100% of the recommended rate were applied. The results showed that the use of superabsorbent polymers (SAP) and the local application of fertilizers with increasing their rate, a significant increase in chlorophyll b and the number of chlorophylls. However, the use of SAP reduced the activity of antioxidant enzymes in the leaf (superoxide dismutase by 9.5–23.2%; glutathione S-transferase by 7.4–13.4%; peroxidase by 8.4–19.0%). The bulb’s weight with the absorbent increased by 31.2–45.4% compared to similar options without the introduction of absorbent. The local fertilizer without absorbent increased garlic yield by 3.5–13.9% relative to control. With the introduction of the absorbent, the local application of fertilizers contributed to the increase of yield by 4.2–25.4%. The application of fertilizers at the rate of 50 and 75% separately and together with the absorbent contributed to the improvement of nutritional value (dry matter, ash, proteins and carbohydrates, fat and caloric content of products). In conclusion, the combination of SAP with local fertilization in crop production technology can be used in today's dynamic climate conditions, due to their beneficial effects on plant productivity and savings and efficient use of water and fertilizers. Further research consists of a more detailed study of the rate of application of absorbents, the duration of their effective action, and the rate and ratio of nutrients.
  • Kirje
    Tehismullad Eesti muldade klassifikatsioonis: nomenklatuur, rajamine ja erinevused-sarnasused normaalselt arenenud muldadega
    (Estonian Academic Agricultural Society, 2022) Kõlli, Raimo; Leedu, Enn
    Technogenic soils (TS) or Technosols are year 2022 soils of Estonia. In Estonian Soil Classification (ESC) totally 17 technogenic soil species is listed (Table 1). By way or mode of their forming or establishing almost four TS groups (formed on heaps of wastes, instead of removed soil cover, on mixed soil horizons with parent materials and buried soil covers) have been separated. In dominating cases by technological elaborating works much more than only humus cover are enfold. In the vertical profile of different development stages TS the humus cover, consisting from fine earth subsoil and parent material may be presented (or occur). In the work separately the formed on mineral and organic (mostly peats) origin parent material TS are treated. Among mineral TS by their moisture conditions the automorphic, moist and wet soils are distinguished. Among peaty TS the formed on fen (sapric) and bog (fibric) peats soils are prevailed. The main difference between grounds (non-soil) and TS is their functioning. The real TS is as sustainably functioning assemblage of soil and plant covers or soil-plant system. The concordance or matching of presented in ESC TS’ taxa with World Reference Bases for Soil Resources (WRB) and Polish Soil Classification taxa was elucidated by comparable analysis. The distribution and forming of soils associations with normally developed soils and non-soils (grounds) is characterised by mean of excerpts from digitalized large-scale soil map (1:10,000) and schematic distribution maps. In the work as well the peculiarities of establishing technologies of mineral and peaty TS is treated.
  • Kirje
    Investigation of properties of sunflower and rapeseed oils obtained by the soxhlet and microwave extraction methods
    (Estonian Academic Agricultural Society, 2022) Bandura, Valentyna; Fialkovska, Larysa; Osadchuk, Petro; Levtrynskaia, Yuliia; Palvashova, Аnna
    The main purpose of the study was to evaluate the possibility of replacing hexane, which is traditionally used for the extraction of vegetable oils, with ethanol as a safer solvent when extracting oil from sunflower meals and rapeseed in the microwave field. Thus, the influence of the solvent type on physicochemical characteristics of oil and the low-fat meal was studied. The main indicators of the composition and quality of sunflower and rapeseed extraction oil were studied. The quality of oil and ways of its use in food products are mostly determined by its fatty acid composition. Analysis of the fatty acid composition of the oil was performed by the method of gas chromatography using a column HP-88 100 m* 0.25 mm*0.20 µm. The possibility of using oil in food was established by conducting pilot laboratory studies and investigating changes in physicochemical parameters during storage. The extraction by the Soxhlet method (hexane as a solvent) was compared with the method of extraction of raw materials in a microwave field (ethyl alcohol as a solvent). Studies of physicochemical parameters indicate the degree of oil oxidation (determination of peroxide and anisidine values). The peroxide value is an indicator of the content of primary oxidation products. The peroxide value of the oil obtained by the method of Soxhlet extraction (hexane as a solvent) was 5.0 (½O mmol) kg–1 . The peroxide value of the oil obtained by extraction in a microwave field (ethyl alcohol as a solvent) was 3.8 (½O mmol) kg–1 . The anisidine value is an indicator of the content of aldehydes in vegetable oils (secondary oxidation products). The anisidine value of the oil obtained by the method of Soxhlet extraction (hexane as a solvent) was 0.3 s.u. The anisidine value of oil obtained by extraction in a microwave field (ethyl alcohol as a solvent) was 0.2 s.u. Comparing the data of peroxide and anisidine values, it can be argued that the oil obtained by extraction of raw materials in a microwave field (ethyl alcohol as a solvent) had the best indicators. The acid value is one of the main qualitative indicators that characterize the degree of oil freshness. The acid value of the oil obtained by the method of Soxhlet extraction (hexane as a solvent) was 3.1 (mg KOH) g –1 . The acid number of the oil obtained by extraction in a microwave field (ethyl alcohol as a solvent) was 2.1 (mg KOH) g –1 . A comparison of the acid values of oils extracted from the raw material by different extraction methods shows that the oil obtained by the method of extraction of raw materials in a microwave field using ethyl alcohol as a solvent has the best acid value. Studies have shown that the oil, which was obtained by extraction of raw materials in a microwave field using ethyl alcohol as a solvent, had the best resistance to oxidation during storage (three months).
  • Kirje
    Effect of fungicides on mycosis progression and potato yields
    (Estonian Academic Agricultural Society, 2022) Sayuk, Oleksandr; Plotnytska, Natalia; Troyachenko, Ruslan; Ovezmyradova, Olga
    The efficiency of crop cultivation technologies, including potatoes, can decrease under the influence of pests, especially in the case of untimely or low-quality protective measures. Pathogens parasitizing the vegetative surface of plants have a significant impact on the quality and yield of potato tubers. Such pathogens are fungi Phytophthora infestans (Mont) de Bary, Alternaria solani Sorauer and Alternaria alternata Keis, which are the causative agents of late blight and early blight. Early manifestation and significant development of these diseases during the growing season can lead to losses, which are estimated at 4 billion euros per year. Studies by many scientists reveal a significant positive result from the use of fungicides during the growing season of plants, harvesting and storage of crops. This article investigated the efficacy of fungicides against late blight and early blight and their effects on yield and tuber quality of the early maturing potato variety Bellarosa. The research was conducted from 2018 to 2020 at the PE Zherm of the Zhytomyr region Ukraine. The experiment scheme consisted of the following variants: Control – spraying of plants with water; Variant 1. Ridomil Gold MC 68 WP, (mancozeb, 640 g kg–1 + metalaxyl M, 40 g kg–1) – 2.5 kg ha–1 – the reference variant; Variant 2. Infinito 61 SC, 68.75% (fluopycolide, 62.5 g L–1 + propamocarb hydrochloride, 625 g L–1) – 1.5 L ha–1; Variant 3. Quadris TOP 325 SC, 32.5% (azoxystrobin, 200 g L–1 + difenoconazole, 125 g L–1) – 0.8 L ha–1. It has been established that the application of fungicides in the potato plantings against late blight and early blight reduces the spread of the leaf spot by 1.4–2.0 times at the end of the vegetation period, and its development – by 1.8–2.9 times in comparison with the Control variant. An increase in yield of potato tubers of Bellarosa variety due to the application of fungicides against leaf spot disease was within 4.5–10.9 t ha–1 in comparison with the Control variant. Among the studied preparations, the best indicators were obtained when using the fungicide Infinito 61 SC, 68.75% in potato plantings against late blight and early blight. Application of this preparation helped to reduce the spread of the studied diseases by 2.0 times, the development of diseases by 2.9 times, and increase the yield by 1.4 times compared to the variant without fungicides application. Application of fungicides also contributed to the improved quality of the tubers; in particular, we observed an increase of the dry matter content in tubers by 0.1–0.6%, ascorbic acid – by 0.2–1.1 mg% 100 g–1 compared to the variant without using the preparations.
  • Kirje
    Effectiveness of different adjuvants on efficacy of stellar (topremazone plus dicamba) applied at reduced rates in maize (Zea mays L.)
    (Estonian Academic Agricultural Society, 2022) Pacanoski, Zvonko; Salij, Alirami; Mehmeti, Arben
    Field experiments were carried out in 2017 and 2018 on two individual farms that grew maize for grain, in Tetovo and Skopje locality, to determine the effectiveness of different adjuvants on the efficacy of Stellar applied at reduced rates. Herbicide treatment selectivity and influence on grain yield were estimated, as well. Both sites were naturally infested with a high population of Polygonum lapathifolium L., Chenopodium album L., Echinochloa crus-galli (L.) P. Beauv. and Sorghum halepense (L.) Pers. Overall efficacy of herbicides in control of weeds 28 DAT was ranged of 77% (Stellar + White oil applied at 0.125 + 0.2 L ha–1 ) to 98% (Stellar + Trend applied at 0.75 + 1.0 L ha–1 ) in Tetovo locality, and 64% (Stellar + White oil applied at 0.125 + 0.2 L ha–1 ) to 99% (Stellar + DASH applied at 0.75 + 2.0 L ha–1 ) in Skopje locality, respectively. In both localities, the efficacy of the full rate of Stellar (90 and 80%, respectively) was on the level of Stellar + White oil applied at 0.25 + 0.2 L ha–1 (90 and 78%, respectively). Herbicide efficacy 56 DAT was similar to the previous period of estimation. Efficacy of herbicide and herbicide plus adjuvants treatments in control of prevailing weeds 28 and 56 DAT ranged from 22–100% in Tetovo locality and 30–100% in Skopje locality, respectively. No visual maize injured was determined by any herbicide treatments in both localities for both years. Maize grain yields for each treatment in both localities generally reflected overall weed control.
  • Kirje
    Retrospective: Duration and efficiency of dairy cows productive lifespan depending on age at first calving and first lactation milk productivity
    (Estonian Academic Agricultural Society, 2022) Siriak, Vitalii; Polupan, Yuriy; Stavetska, Ruslana
    The retrospective analysis involved 562 Holstein cows, 545 Ukrainian Black-and-White dairy cows and 100 Ukrainian Red-and-White dairy cows in Breeding Station Terezyne, Kyiv region. The influence of age at first calving and first lactation milk yield on the duration and efficiency of the productive lifespan of cows was studied. The results showed that with the increase of age at first calving from less than 22 to more than 34 months there was a steady tendency to reduction in the longevity and lifetime productivity of cows. There was found a statistically significant (P <0.001) inverse correlation between the age at first calving and indicators of duration and efficiency of productive lifespan (r = –0.177…–0.459). The age at first calving determines 3.0–21.2% of the phenotypic variability of the considered indicators of duration and efficiency of the productive lifespan of cows (P <0.001). According to the set of features, the most rational is the planning of age at first calving before 26 months, i.e. heifers need to be served before 15 months of age. With the first lactation milk yield increasing, the duration and efficiency of the productive lifespan of cows increase curvilinearly. Higher longevity is typical for cows with an average 305-d milk yield in the first lactation of 6 001–8 000 kg, and higher lifetime productivity – with the highest milk yield in the first lactation (over 9 000 kg). There was found a relatively low positive correlation between 305-d milk yield in the first lactation and the parity and lifespan (r = 0.087…0.164, P <0.001) and a moderately significant relationship – with lifetime productivity and lifetime daily milk yield (r = 0.327…0.504, P <0.001). The milk yield of primiparous cows has a relatively low impact on the variability of lifespan, productive lifetime and total lactation length (ηx 2 = 3.6–5.6%, P <0.001) and a higher impact on the indicators of lifetime milk productivity and milk productivity per one day of life, productive lifetime and lactation (ηx 2 = 12.5–35.6%, P <0.001). The productive lifespan of cows with first lactation milk yield over 6 000 kg can be considered quite effective.
  • Kirje
    Application efficacy of newly released pre-mixed herbicide in winter wheat: Joystick®
    (Estonian Academic Agricultural Society, 2022) Mamnoie, Ebrahim; Karaminejad, Mohammad Reza; Aliverdi, Akbar; Moeini, Minbashi Moein
    In a field experiment, the efficacy of the newly released pre-mixed herbicide, Joystick®, in comparison with other pre-mixed herbicides was evaluated in winter wheat, Iran. The treatments included: weedy check, weed-free check (hand-weeded), Bromicide®MA at 600 g a.i. ha–1 + Axial® at 60 g a.i. ha–1 , Othello® at 96 g a.i. ha–1 , Axial One® at 55, 65, 75, and 85 g a.i. ha–1 , Joystick® at 80, 94, and 108 g a.i. ha–1 . The latter three treatments mentioned were applied with and without non-ionic surfactant Citogate® at 0.1% v v–1 . The results revealed that all treatments significantly decreased the density and dry biomass of each weed species and increased the grain yield and biological yield of wheat. The highest performing treatment was Bromicide®MA + Axial®, followed by Joystick® at 108 g a.i. ha–1 plus Citogate®. The application of Joystick® at 108 g a.i. ha–1 plus Citogate® decreased the biomass of Malva neglecta, Lolium rigidum, Hirschfeldia incana, Centaurea pallescens, Veronica persica, and Carthamus oxyacantha up to 96.2, 78.1, 100, 91.0, 91.0, and 96.1%; respectively; with an 88% reduction in total weed dry biomass. Because of Joystick® at 108 g a.i. ha–1 plus Citogate® activity against weed species, the grain and biological yields of wheat improved up to 28% as compared to weedy check treatment.
  • Kirje
    Research of a contact stresses in swivel elements of flexible shaft in screw conveyor for transportation of agricultural materials
    (Estonian Academic Agricultural Society, 2022) Bulgakov, Volodymyr; Olt, Jüri; Ivanovs, Semjons; Trokhaniak, Oleksandra; Gadzalo, Jaroslav; Adamchuk, Valerii; Chernovol, Mykhailo; Pascuzzi, Simone; Santoro, Francesco; Arak, Margus; Estonian University of Life Sciences. Institute of Forestry and Engineering
    The paper presents the new design of the rotating part with ball-bearing swivel joints between its sections for flexible screw conveyors. The new design provides for the improvement of the operation efficiency and loading capacity, the enhancement of the technological capabilities and the reduction of the admissible curvature radius. The contact stresses in the swivel element as the most loaded area in the rotating part have been analysed. It has been established that the maximum contact stresses arise at the points of contact between the ball and the flat surface of the slot in the cylindrical bushing. The recommended design limitation range for the cavity cone angle is within about 30–50. The relation between the loads and the stresses depending on the operating conditions has been modelled with the use of computer modelling. The comparison of the computer modelling results and the obtained calculation data has proved that the difference between the respective values varies within the range of 11–26%.
  • Kirje
    Fortification of meat products of geese farming with lithium by introducing it into poultry mixed feed
    (Estonian Academic Agricultural Society, 2022) Sobolev, Olexander; Borshch, Olexander O.; Riznychuk, Ihor; Kyshlaly, Olena
    We studied the possibility of fortification of goslings’ products with lithium and peculiarities of its depositing in the organs and tissues of goslings concerning lithium level in the mixed feed. Experimental studies have been conducted on the goose breed Legart. 320 one-day-old goslings were divided on the principle of analogues into four groups, 80 heads each. The goslings of the first control group did not receive the lithium supplement with the feed mix. Experimental groups were fed with the feed where additionally was supplemented with different doses of lithium by the scheme of the experiment. After 70 days of rearing, three birds were randomly selected from each group and control slaughtered. The lithium content in the representative samples of muscle tissue and organs of goslings was determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES). It was established that feeding the growing goslings with mixed feed containing lithium supplements in doses of 0.05, 0.10 and 0.15 mg kg–1, contributed to the increase (P <0.001) of the concentration of this trace element in the muscles of the thigh and drumstick 789.5, 1589.5 and 3447.4%, in the muscles of the breast 1096.8, 2080.6 and 3948.4%, liver are 455.4, 824.6 and 1440.8% respectively, compared to goslings that did not receive lithium supplements. Significant high values of lithium accumulation factors in organs and tissues of gosling (3.21–14.44) indicated that this element has a substantial accumulating capacity. The meat of goslings enriched with lithium can be considered a natural product with bio- corrective action that can be used in human nutrition. These meat products can be particularly useful for people that are living in regions with a low environmental level of lithium.
  • Kirje
    The impact of nano fertilization and salicylic acid on growth, yield and anti-oxidant contents in rocket plant under salt stress
    (Estonian Academic Agricultural Society, 2022) Al-Taey, Duraid K. A.; Al-Musawi, Zahraa J. M.
    This investigation aimed to study the effect of organic fertilizers, nano-fertilizers and salicylic acid on the growth and yield of rocket (Eruca sativa L.) and the content of active compounds and antioxidants when the plants were exposed to salt stress. The experiment was conducted using a randomized complete block design (RCBD) according to the split-plot system. The main factor was water quality (1.2 dS m–1 and 8 dS m–1). While the combination treatments of Nano fertilizer, Salicylic acid and poultry manure were distributed in sub-plots and each treatment included three replicates. The treatments irrigated with saline water showed a reduction of glucosinolate and ascorbate contents (58 μg g–1 and 105.71 μg g–1, respectively). Salinity led to an increase in glutathione and proline in the leaves (1146 and 2.2 μg g–1, respectively), while the fertilization treatments (poultry manure + nano-NPK; poultry manure + salicylic acid + nano-NPK) resulted in an increase in the glucosinolate content of the leaves under salt stress (85.6 and 89.2 μg g–1, respectively). The nano-NPK treatment achieved a high value of the leaves’ ascorbic acid content under the unstressed conditions (166.73 μg g–1), while the salicylic acid + nano-NPK treatment achieved the highest value of ascorbic acid under salt stress (137.4 μg g–1). The combination of salicylic acid + poultry manure + nano-NPK obtained the highest value of glutathione content in the leaves (1950 μg g–1) under the stress conditions. There is a positive correlation between salt stress and glutathione + proline, while the salt stress condition had a negative effect on glucosinolate, ascorbate and yield.
  • Kirje
    Estimation of species allelopathic susceptibility to perennial weeds by detailing the formation period of germinated seeds of oilseed radish (Raphanus sativus L. var. oleiformis Pers.) as the test object
    (Estonian Academic Agricultural Society, 2022) Tsytsiura, Yaroslav H.
    The allelopathic impact of 23 perennial weed species on oilseed radish by petri dish and soil bioassays was studied. Weed extracts were prepared at concentrations of 0.25, 0.5, 1.0, 2.0, 4.0, 8.0 and 16.0%. The influence of the weed extract on germination and seedling growth of oilseed radish was analyzed according to several germination indexes. The "speed of germination", "coefficient of the velocity of germination" and the resulting levels of allelopathic potential in terms of seed germination (APG) were used to assess the allelopathic effect of the researched weed species. The application of indicators allowed determining the specific features of the influence of extracts of perennial weeds on the duration of the germination period, the effects of germination delay and the general prolongation of the period of formation of similar seeds with typification on classification groups. Conducted daily surveys for the calculation of these indices allowed to obtain a graphical interpretation of the reaction of the seeds of the test object to the extract of each weed species. This allowed identifying species of weeds for which the use of oilseed radish in the system of its biological control will be effective.
  • Kirje
    Short communication: Guttation of oat and wheat and the results of its comparison with the yield
    (Estonian Academic Agricultural Society, 2022) Nugis, Edvin; Kuht, Jaan
    The present paper aims to give an overview of results collected in the Estonian Crop Research Institute related to the comparison between guttation and yield in grain crop cereals. The objects of research were oat variety 'Eugen' and wheat 'Manu', which went through the stages of germinating their seeds (in vitro), set them by sprouts down into the soil, and the emergence of sprouts under conditions of a hydrothermostat. Since transpiration in a hydrother- mostat at an air temperature of 23 °C, and an extremely high value of air relative humidity was limited, therefore, due to this, the plant sprouts have begun to exude guttation fluid. As result, we have found that the amount of isolated gutted fluid correlates significantly with the grain yields of field trials indicators. The comparison between relative guttation and relative yield was described by a straightforward relationship. The entire experiment took about one week, and the first results of droplet prints on filter paper can be obtained after 60 hours. This was the novelty of our approach which provides the prerequisites for both increasing the reliability of conclusions regarding the yield obtained and with forecast.