Organic EprintsAgronomic and environmental factors explaining Grain Protein Content variability in organic winter wheatMarionCasagrandeauthorChristopheDavidauthorCatherineEtienneauthorDavidMakowskiauthorMurielValantin-MorisonauthorMarie-HélèneJeuffroyauthorA regional agronomic diagnosis was implemented to identify factors responsible for low values of Grain Protein Content (GPC) in a network of 35 organic winter wheat fields in South-Eastern France. The influence of water nutrition, radiation and temperature, weed density at flowering, nitrogen (N) status of crop at flowering and variety type were studied. Two statistical methods were used successively: classical linear regression and a mixing model approach based on a weighted sum of all possible linear combinations of explanatory variables. GPC was significantly related to variety type, crop N status and weed density. An analysis of variance showed that weed density was related to soil type and nitrogen supply. Cereals, pulses and oilseeds2008Conference paper, poster, etc.

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