Evaluation of organic sunflower fertilization using δ 15 N values
作者： Rainer Georg Joergensen , Ion Toncea , Markus Boner , Jürgen Heß
DOI: 10.1007/S13165-018-00241-3
关键词:
摘要: This study was carried out to determine the effects of urea fertilization, legumes as a component crop rotation, and soil type rich in organic matter on δ15N values sunflower (Helianthus annuus L.) samples taken traded or directly sampled from farms. The aim is use control fraud related inorganic N fertilization farming systems near future. Median for separated into four origin/quality groups significantly increased order organically controlled (ΣOC) China (1.0‰), ΣUrea (2.2‰), ΣOC lots (4.2‰), ΣBio+ (4.6‰). presence alfalfa (Medicago sativa rotation decreased by 1.9‰. Regular FYM (and compost) application resulted 0.3‰ higher compared with absence fertilization. increase not significant, due small number observations, contrasting numerous published studies. Growth Chernozems led an 1.1‰ Phaeozems. measurement useful but perfect tool detect fraudulent At OC level, 97.5% European were above 2.8 even 3.2 at Bio+ so that 3.0 seems be reasonable threshold taking further controlling action. possibility will willingness producers comply rules.
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