Sirvi Autor "Cerina, S." järgi
Nüüd näidatakse 1 - 5 5
Tulemused lehekülje kohta
Sorteerimisvalikud
Kirje Economic assessment of use of pulses in diets for captive red deer(2021) Proskina, L.; Cerina, S.The quality of compound feeds used in livestock diets could be enhanced by means of domestically produced pulses. Nevertheless, there are available few research studies that would allow us to identify the economic efficiency of livestock diets with pulses and the digestibility of protein by livestock for deer farming. Accordingly, the present research aims to identify the economic efficiency of diets supplemented with domestically produced pulses - faba beans, peas and lupine beans - for captive deer. The research conducted a feeding experiment on captive deer (Cervus elaphus) kept in fenced areas to identify the economic efficiency of diets supplemented with three legume species: peas (variety ‘Vitra’), faba beans (variety ‘Fuego’) and narrow-leaved lupin seeds (variety ‘Boregine’). Deer productivity was assessed by live weight, live weight gain, feed intake and protein efficiency ratio during the experimental period, as well as feed cost per live weight gain unit. The research found that feeding deer diets containing peas, faba beans and lupine beans as protein-rich feedstuffs was economically advantageous - at the same cost of feed, deer productivity increased and per-unit production costs decreased. Live weight gains during the experimental period were 1.02% higher in group 2 (pea diet), 1.78% higher in group 3 (faba bean diet) and 2.91% higher in group 4 (lupine diet) than in the control group. During the experimental period, the highest protein efficiency ratio was found in group 4 fed a diet containing lupine beans - a unit of protein fed (1 kg) yielded the highest weight gain or 0.43 kg. Feed costs per kg of live weight gain were the lowest in group 4 (2.32 EUR kg-1 ), 2.48 EUR kg-1 in group 3 and 2.70 EUR kg-1 in group 2, which was 20.56%, 14.81% and 7.39%, respectively, lower than those in the control group.Kirje Effect of sapropel fertilizer on the quality of the yield of some field crops(Estonian University of Life Sciences, 2023) Zarina, L.; Cerina, S.; Proskina, L.Sapropel is specific water body sediments containing a high level of organic matter formed from remains of water biota mixed with mineral components. One of the most promising utilisation ways of sapropel is agriculture where it can be used as soil amendment to improve soil physical properties and thus obtain economically viable and high quality yield of field crops. For three years the experiments were conducted at Priekuli Research Centre of the Institute of Agricultural Resources and Economics. Dehydrated sapropel mass from Lake Bizas was studied as soil biological fertilizer to determine its suitability for use in field crop production. Researches were carried out in organic crop rotation, in the fields of potato, winter rye and field bean. Three different doses of sapropel fertilizer were applied. During the three-year period (2020–2022), the yield indicators of the plant species included in the study were evaluated, and the quality of the yield of these species was assessed. The results of research confirm the positive effect of sapropel on yield quality indicators - protein (field beans), starch (potatoes) falling number and 1,000 seed mass (winter rye).Kirje Exploring the economic viability and agronomic effects of green manure mixtures on winter wheat yields in organic farming in Latvia: a multi-location study(Estonian University of Life Sciences, 2025) Morozova, I.; Jansone, I.; Cerina, S.This study explores the adaptation of green manure practices to Latvia’s climatic and soil conditions to enhance soil productivity and economic returns in organic farming systems. The study aims to identify the most suitable green manure mixture by evaluating economic factors, dry matter yield, nutrient amount, and its impact on winter wheat yields in organic fields across different locations in Latvia, considering variations in meteorological conditions. Field trials compared three mixtures: oats-mustard-oilseed rape–buckwheat (non-legume), oats-buckwheat-peas (legumes < 50%), and oats-lupin-vetch (legumes > 50%) against a control (black fallow). Data were collected on dry matter production, nutrient accumulation (N, P, K amount), winter wheat yields, and economic performance. The results revealed a significant variation in dry matter yield depending on year and location. Mixture with non-legumes at the farms ‘Gaikeni’ and ‘Geidas’, as well as mixture with legumes below 50% at ‘Gaikeni’, Ltd. ‘Mazbungas’, and ‘IRGK serviss’, produced significantly higher dry matter yields (P < 0.05). Despite lower biomass yield in certain years, mixture with legumes above 50%, through the follow-up effect, significantly increased winter wheat yields under optimal conditions at Ltd. ‘Mazbungas’ and farm ‘Gaikeni’ being higher by 96.05% and 93.59%, respectively, compared to the control. Economic analysis revealed significant gross margin advantages for green manure cultivation, demonstrating its financial viability. This study underscores the potential of green manure practices in enhancing the sustainability of organic farming, improving yields, and increasing profitability, while highlighting the importance of selecting region-specific mixtures to account for climatic variability.Kirje Gross margin comparison of cultivation of different legume species in the organic farming system(2021) Zarina, L.; Zarina, L.; Piliksere, D.; Cerina, S.In order to identify the most suitable varieties for organic farming, the Institute of Agricultural Resources and Economics in 2018 started study four legume species. The independent variables of the study were the legume genotypes: faba bean (Vicia faba L., cv. ‘Isabell’, ‘Lielplatone’, ‘Laura’, ‘Boxer’), field pea (Pisum sativum L, cv. ‘Astronaute’, ‘Bruno’, ‘Rebekka’, ‘Zaiga’), narrow lupine (Lupinus angustifolius L., cv. ‘Sonet’, ‘Probor’, ‘Derliai’, ‘Haags Blau’), and soya (Glycine max L., cv. ‘Annucha’, ‘Sculptor’, ‘Augusta’). The soil types of the experimental organic field were sod–podzolic, sandy loam, and loamy sand. At the start of the study the organic substance concentration was 15–18 mg kg-1 , pHKCl was 5.3–5.98, the concentration of plant - available phosphorus (P205) was 133.2–182.9 mg kg-1 , and the concentration of potassium (K2O) - 69.2–109.7 mg kg-1 . Green manure (buckwheat) was a pre-crop, incorporated in autumn. For the comparison of economic indicators, the gross coverage calculation was used, which based on the difference obtained by subtracting variable costs from the valuation of gross output. All variable costs and revenues were included in the gross margin calculation without value added tax. The study indicated large differences in yields between genotypes. From the economic point of view, the most suitable cultivars for cultivation according to the organic farming method were: field beans - ‘Isabell’ and ‘Lielplatone’ with average gross cover (GC), 505.40 and 504.60 EUR, respectively, field peas - ‘Bruno’ (GC 379.60 EUR), narrow-leaved lupin - ‘Derliai’ (GC 647.70 EUR), soybeans - ‘Sculptor’ (GC 204.40 EUR). Among the legume species studied, lupine showed the highest economic performance, among the genotypes - cultivar ‘Derliai’ (α = 0.05).Kirje Legumes in the diet of dairy cows from the economic perspective(2017) Proskina, L.; Cerina, S.Based on the experimental data, one can conclude that feed rations may comprise peas var. ‘Bruno’ and faba beans var. ‘Lielplatone’ grown in Latvia, thereby replacing the use of imported soybean cake. After summarising the results of trials, one can conclude that the diets comprising only one kind of legumes (peas or beans) were the most economically efficient, while the highest production efficiency was achieved if incorporating 22–24% ‘Lielplatone’ faba beans into the diet for dairy cows. In Europe and Latvia, foods of animal origin comprise, on average, 45% of the total agricultural output value; an essential role in the production of the foods is played by the supply of protein-rich feedstuffs to the livestock industry. An analysis of the factors influencing productivity in dairy farming shows that a diet is the most important factor that promote or hinder the functioning of the inherited genetic potential. In order to meet the dietary energy, protein and mineral requirements of cows, the cows have to be fed a diet according to their physiological condition. In recent years in many countries, research investigations into protein sources have been conducted, as a high protein content of feedstuff is the most expensive component of a feed ration. For this reason, their use in livestock diets might be economically inefficient and therefore the key focus has to be placed on opportunities to increase the content of protein in domestically produced feeds.