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Sirvi Autor "Piliksere, D." järgi

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  • Pisipilt
    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).
  • Pisipilt
    Kirje
    The impact of crop management regime on oil content and fatty acid composition in hulless and covered spring barley
    (Estonian University of Life Sciences, 2022) Legzdiņa, L.; Ivdre, E.; Piliksere, D.; Vaivode, A.; Mieriņa, I.; Jure, M.
    Lipids are a minor nutritional component of barley (Hordeum vulgare L.) grain and have not been as widely explored as the major components. The aim of this study was to investigate the effect of genotype and environment, including conventional farming system with three crop management regimes, differing in agrochemical input, and organic farming system, on oil content and fatty acid composition in grain of two covered and four hulless spring barley genotypes during two growing seasons. Genotype significantly affected oil content and it was on average 4.26% and ranged in individual barley samples from 2.87 to 5.53%. We found linoleic, oleic, palmitic, α-linolenic, stearic and capric fatty acids in average proportions of 55.6; 21.3; 18.6; 3.7; 0.6 and 0.4%, respectively. Higher average oil content and proportion of α-linolenic acid was found in covered barley. Crop management regime did not significantly affect oil content but had some effect on the proportion of linoleic, α-linolenic, oleic and stearic acid. Decrease of chemical inputs was in favour of oil content and proportion of α-linolenic, oleic and stearic acids but did not promote linoleic acid. Waxy hulless barley line with high oil content and a very high proportion of linoleic acid was identified.