Above-ground Dry Matter Accumulation of Cotton Genetics at Different Nitrogen Applications
Field experiments were conducted to analyze the dynamics of LAI, accumulation of above-ground dry matter and above-ground itrogen content for three cotton varieties(Bt variety 33B, conventional variety CCRI 12 and Bt hybrid CCRI 46) under five nitrogen application levels(0, 90, 180, 270 and 360 kg·hm~(-2)) in a randomized completed block design in Anyang. The expolinear growth equation was used to simulate the dynamic of cotton above-ground dry matter; and a power function was used to describe nitrogen dilution. The results showed that:(1) the expolinear growth equation was well fitted to the growth of cotton above-ground dry matter, and the parameters could reflect the influence of interaction between cotton genetics and nitrogen applications. (2) The power function of dry matter and nitrogen content showed the declination of cotton above-ground nitrogen content with the dry matter accumulation, the parameter could be used to explore the ability of nitrogen uptake. (3) The analysis of above-ground dry matter accumulation and nitrogen dilution effect, showed that the appropriate rate of nitrogen application was 180 kg·hm~(-2) and excessive nitrogen application had no effect with cotton growth and nitrogen uptake.
cottonabove-ground dry matter accumulationnitrogenexpolinear growth equationnitrogen dilution function
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