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- W2508516466 abstract "Abstract The nitrogen content of the above-ground biomass of crop and weeds was assessed one week after crop heading in the beginning of July in spring barley and spring wheat. Crops were sown with a combined sowing and fertilizing machine at five seed rates. The trial plots received nitrogen, 90 kg ha−1. No herbicides were applied. In spring barley sown at a normal seed rate, less than 5% of the nitrogen in the above-ground biomass was accumulated in weeds. In spring wheat stands the corresponding amount averaged 10–15%. The nitrogen concentration in the crop biomass averaged 1.8% of the dry weight and that in mixed weed species 3.2%. Under normal growth conditions the N concentration in crop and weeds was relatively constant at the time of crop heading. Variations in N accumulation between crop plants and weeds are explained by the different biomass production of the plants." @default.
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- W2508516466 date "1992-12-01" @default.
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- W2508516466 title "Distribution of Nitrogen between Crop and Weeds in Spring Cereals" @default.
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- W2508516466 doi "https://doi.org/10.1080/09064719209410215" @default.
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