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Thirty-four varieties of wheat were studied in a multisite experiment, under various environmental conditions. For all the characters affecting poultry feeding, except phosphorus, genotypic effects were highly significant. However, only potential applied viscosity appeared as a stable character essentially dependent on the genotype. Protein content, water-insoluble cell wall content and two characters...
We present a model which describes the spatial organization of land use in a farming territory and which produces maps of land use. The model is defined at the village scale in French regions with grouped settlements and mostly with mixed crop-livestock farming systems. It is based on qualitative agronomical rules which define how land is used depending on the characteristics of the territory (soil,...
The degradation of metolachlor and terbuthylazine, two maize herbicides, was studied in laboratory in a sandy clay loam soil under different temperature and soil moisture conditions and in drainage field lysimeters. Identification of the main degradation products of the two herbicides was attempted both in laboratory and field lysimeter soil samples. The results show that the degradation of the two...
A winter wheat (cv Soissons) crop was made N deficient during stem elongation. The effects of the N stress were quantified by measuring the nitrogen nutrition index (NNI) (used as reference), proteolytic activity in the leaves, the rate of carbon dioxide (CO 2 ) assimilation by the leaves, green leaf area, chlorophyll concentration of the leaves and crop reflectance. A reduction in available...
Two populations of Phthorimaea operculella (Zeller), one of them presumed to be resistant to Dipel (a commercial preparation of Bacillus thuringiensis delta-endotoxins), and the other susceptible, were grown on four cultivars of potatoes, two of them a first generation of transgenic plants, expressing the Bacillus thuringiensis Cry1Ab delta endotoxin protein, and the other two untransformed. The...
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