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| 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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| Casagrande, Marion; David, Christophe; Valantin-Morison, Muriel; Jeuffroy, Marie-Hélène. |
| French organic farmers are asked to increase Grain Protein Content (GPC) of organic winter wheat to guarantee the breadmaking quality required from millers. Facing with the recent depletion of organic products, farmers also need to stabilize and increase the yield performance. The aim of our study is to give the explanations of the yield and GPC variability generally observed in organic production. A diagnostic method will be implemented on a network of ca. 10 fields per year during two crop years added with previous field network (77 fields) and experi-ments (4 experiments on cultivars). We will under-stand yield and GPC performance from environmental and agronomic conditions and relate the observed limiting factors with crop management, climatic... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds. |
| Ano: 2006 |
URL: http://orgprints.org/7358/1/ShortpaperMarionCasagrande.rtf |
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| Valantin-Morison, Muriel. |
| In organic systems in France, the yields of WOSR are known to be low and variable due to the lack of references on suitable crop management. The aim of our study was to assess four different crop management strategies for organic WOSR in geo-graphically broad network of farmer’s fields. Theses strategies were built in order to limit the impacts of the main limiting factors, i.e nitrogen / weeds and insects. Experiments comparing the four strategies were performed on a network of farm fields in four contrasted regions over 2 years. This study investi-gated also the potential use of turnip rape trap crop to control insect pests on organic winter oilseed rape during the third year. The cropping strategies differed in sowing date, crop density and row... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds. |
| Ano: 2006 |
URL: http://orgprints.org/7451/1/Odense2006.rtf |
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