EMU DSpace
Digitaalarhiiv EMU DSpace kogub, säilitab ja loob ligipääsu Eesti Maaülikooli liikmeskonna poolt loodud või Eesti Maaülikooli vastutusvaldkondadega seotud teadustöödele toetamaks maaülikooli konkurentsivõimet ja teadmistepõhist ühiskonna arengut. Digitaalarhiivi haldab Eesti Maaülikooli raamatukogu.
Valdkonnad DSpace's
Valige valdkond, et selle kogusid sirvida.
- Institute of Forestry and Engineering (MII)
- Institute of Agricultural and Environmental Sciences (PKI)
- Institute of Veterinary Medicine and Animal Sciences (VLI)
- Publications
- Units
Hiljutised sisestused
Development of an integrated soil quality index under prolonged green manure application of oilseed radish in crop rotation
(Estonian University of Life Sciences, 2026) Tsytsiura, Y.
Over a 12-year study period, the effectiveness of using intermediate green manuring with oilseed radish (Raphanus sativus L. var. oleiformis Pers.) – applied once every two years – was evaluated under conditions of repeated application in the same field within a crop rotation system (including green manuring of crops such as grain sorghum (Sorghum bicolor L.), pea (Pisum sativum L.), soybean (Glycine max (L.) Merrill), sunflower (Helianthus annuus L.), chickpea (Cicer arietinum L.) and maize (Zea mays L.), with three assessment checkpoints in 2014, 2019, and 2025. The results showed that the green-manured treatment, averaged across the entire evaluation period, produced positive changes in the physical and chemical soil fertility parameters within the 0–30 cm soil layer compared with the unfertilized control. Increases were observed in humus content (by 24.65%), water absorption capacity (by 30.04%), easily hydrolyzable nitrogen (by 33.67%), available phosphorus (by 25.72%), exchangeable potassium (by 23.10%), and total porosity (by 25.04%). Decreases were recorded in bulk density (by 19.05%), particle density (by 9.95%), soil hardness (by 33.95%), and pH (by 5.60%). Green manuring also contributed to optimizing the proportion of humic acids in the humus structure by a factor of 1.2 and to achieving a total organic carbon to total nitrogen ratio of 10.36:1, representing an 11.92% increase compared with the control. As a result, the application of green manuring was reflected in an improved integrated Soil Fertility Index, with a value of 0.692 compared with 0.499 in the non-manured control.
Global systematic review of cassava production and meta-analysis of the effects of fertilization on yield
(Estonian University of Life Sciences, 2026) Promnikorn, K.; Saengnuan, P.; Kittipadakul, P.; Kraichak, E.
Cassava plays a significant role in global food security as a staple food crop for billions of people in developing countries. However, the systematic summary of recent studies on cassava production has not been thoroughly compiled. This study aimed to identify key aspects of cassava production, with a particular focus on the effects of fertilization, through a systematic review and meta-analysis. A search of the Scopus database from 1970 to 2022 identified 229 studies on cassava production, of which 83 met the inclusion criteria and were categorized into eight main topics: soil, pest and disease control, genetics and biotechnology, crop management, land, postharvest and physiology, modeling, and environmental factors. The meta-analysis of studies regarding fertilizer application (n = 7) revealed a modest overall effect of fertilization on cassava yield (effect size = 0.75, 95% CI: 0.53–0.96), with micronutrients and macronutrients showing more significant effects compared to organic fertilizers. Additionally, the study found that regional differences influenced fertilization effectiveness, with South America and Southeast Asia showing higher positive responses to fertilization compared to Africa, likely due to varying soil fertility and nutrient limitations. Soil texture also significantly impacted fertilizer efficiency, with silt loam showing the highest fertilizer response. However, the results are based on a limited number of studies, highlighting a critical gap in agricultural research: the lack of comprehensive statistical reporting. This limitation hampers the ability to conduct more robust meta-analyses. Future research should focus on improving statistical reporting practices and exploring region-specific fertilizer strategies to enhance cassava yield sustainably.
Agronomic performance and berry composition of four Cabernet Sauvignon clones under semi-arid viticultural conditions
(Estonian University of Life Sciences, 2026) Deis, L.; Quiroga, A.M.; De Rosas, M.I.; Martinez, L.
Clonal variability in Cabernet Sauvignon provides an opportunity to optimized wine yield and oenological potential under semi-arid conditions where limited water availability and high temperatures can affect grape composition. In this study, we evaluated the agronomic performance and berry characteristics of four clones (7, 15, 169, and 685) grafted onto Paulsen 1103 rootstocks during two consecutive seasons in Argentina. Measurements included plant water status, leaf area, yield components, and berry composition, with particular emphasis on polyphenols and anthocyanins. While no differences in stem water potential were detected, stomatal conductance revealed distinct water-use efficient strategies among clones. Clone 7 showed the highest fertility and productivity but lower polyphenolic content (35% less malvidin 3-glucoside than clone 685), while clone 685 consistently accumulated the highest anthocyanin concentrations despite its lower yield (26% less than 7). Clone 169 combined relatively high yields with intermediate berry composition, while clone 15 showed the lowest productivity with moderate quality parameters. These findings demonstrate that genetic variability among Cabernet Sauvignon clones grown under semi-arid conditions influences both agronomic performance and fruit composition, providing winegrowers with valuable tools for a given environment and to adapt vineyard management to future climate change scenarios.
Bestimmung von Eigenspannungen in Bimetallstäbe und –Platten
(Eesti Põllumajandusülikool, 1995) Kõo, Jakub; Somelar, Jaanus
In diesem Beitrag wird die Theorie der verallgemeinerne mechanische Eigenspannungsmessmethode dargestellt.
Algkõverusega bimetallriba termodeformatsioonide uurimine
(Eesti Põllumajandusülikool, 1995) Kõo, Jakub; Lille, Harri
Artiklis uuritakse teoreetiliselt ja katseliselt pikisuunalise algkõverusega bimetallriba ühtlasest temperatuuri muutusest põhjustatud piki- ja põikkõverust. Nende määramiseks on tuletatud arvutusvalemid. Katsed teostati normaalsest termobimetallist valmistatud proovikehadega. Toodud valemitega arvutatud tulemused on rahuldavas kooskõlas katsandmetega.