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Agronomic and environmental factors explaining Grain Protein Content variability in organic winter wheat Organic Eprints
Casagrande, Marion; David, Christophe; Etienne, Catherine; Makowski, David; Valantin-Morison, Muriel; Jeuffroy, Marie-Hélène.
A 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.
Tipo: Conference paper, poster, etc. Palavras-chave: Cereals; Pulses and oilseeds.
Ano: 2008 URL: http://orgprints.org/11825/1/Casagrande_11825_ed.doc
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Factors limiting the grain protein content of organic winter wheat in south-eastern France: a mixed-model approach. Organic Eprints
Casagrande, Marion; David, Christophe; Valantin-Morison, Muriel; Makowski, David; Jeuffroy, Marie-Hélène.
Organic agriculture could achieve the objectives of sustainable agriculture by banning the use of synthetic fertilizers and pesticides. However, organic crops generally show lower performances than conventional ones. In France, organic winter wheat production is characterized by low grain protein content. There is a crucial need for better understanding the variability of grain protein content, because millers require batches with values over 10.5% of dry matter. Here, a regional agronomic diagnosis was carried out to identify the limiting factors and crop management practices explaining the variability of grain protein content. The studied field network was a set of 51 organic winter wheat plots in south-eastern France. The mixed-model method was used for...
Tipo: Journal paper Palavras-chave: Soil Crop health; Quality; Protection Produce chain management.
Ano: 2009 URL: http://orgprints.org/22523/1/Casagrande_2012_%2322523_Journal%20Paper.pdf
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