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Sirvi Autor "Loit-Harro, Evelin" järgi

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  • Pisipilt
    Kirje
    Can intercropping alter cereal grains dietary fiber composition?
    (Estonian University of Life Sciences, 2024) Khaleghdoust, Banafsheh; Alaru, Maarika; Korge, Mailiis; Esmaeilzadeh Salestani, Keyvan; Loit-Harro, Evelin; Estonian University of Life Sciences. Institute of Agricultural and Environmental Sciences. Chair of Crop Science and Plant Biology
    Barley and oats are essential cereal grains that contribute to satisfying the consumer's need for dietary fibers, namely arabinoxylans (AX) and beta-glucans (BG). Due to the increasing popularity of intercropping as an environmentally friendly and low-cost approach to sustainable intensification of agriculture and crop production, it is important to understand the relationship between mixed cropping on cereal grains' dietary fiber content. Therefore, the effect of intercropping barley and oat with vetch and field pea was studied compared to pure sown barley and oat on grain AX and BG content in two successive years (2022‒2023). Our result showed that oat had consistently higher AX content while barley demonstrated greater BG content. Intercropping had an influence only on barley grains' BG content, but contrary to our hypothesis, intercropping with vetch decreased the overall concentration of BG when compared to barley pure stand, as vetch was a too competitive partner. We found that grain quality parameters, such as thousand kernel weight and test weight, were positively associated with higher BG content in barley grains. Over a two-year period, weather conditions had an impact only on BG content in intercropped treatments. Increased precipitation decreased BG content in oat and barley in 2022 compared to 2023. Both grains AX content was not affected by intercropping or annual growing conditions.
  • Pisipilt
    Kirje
    Kartulipealsete N, P ja K sisaldus 85. kasvupäeval ning nende seos mugulate kuivainesaagiga 100. kasvupäeval mahe- ja tavaviljeluses
    (Eesti Maaülikool; Maaelu Teadmuskeskus, 2026) Eremeev, Viacheslav; Margus, Kalle; Kuht, Jaan; Loit-Harro, Evelin; Luik, Anne; Talgre, Liina; Eesti Maaülikool. Põllumajandus- ja keskkonnainstituut. Taimekasvatuse õppetool; Eesti Maaülikool. Põllumajandus- ja keskkonnainstituut. Taimetervise õppetool
    This study examined whether potato haulm nutrient uptake near the end of the growing period is associated with tuber dry-matter yield and whether these relationships differ between organic and conventional management. Data were obtained from the long-term farming systems experiment at Eerika, Estonia for the periood of 2013–2016. Haulm was sampled on day 85, and total N, P and K uptake (kg ha–1) was calculated from nutrient concentrations and haulm dry mass. Tuber dry matter yield (t ha–1) was determined on day 100. Associations were evaluated using linear regression and Pearson correlation separately for organic (n = 48) and conventional (n = 64) systems. For N, the association with tuber dry-matter yield was statistically significant but weak in the conventional system (R = 0.27; p < 0.001) and not significant in the organic system (R = 0.19; p = 0.20). The strongest association was observed for phosphorus (conventional R = 0.78, p < 0.001; organic R = 0.31, p < 0.05). For potassium, the association was strong in the conventional system (R = 0.68; p < 0.001), but not significant in the organic system (R = 0.23; p = 0.114). Overall, late-season haulm nutrient uptake – particularly phosphorus – was associated with tuber dry matter yield, with stronger and more consistent associations in the conventional system.