Effect of Nitrogen Applied Levels on the Dynamics of Biomass, Nitrogen Accumulation of Cotton Plant on Different Soil Textures

A field experiment with two soil textures(sandy loam and clay loam) and different levels of nitrogen application(0,105,210,315,420 kg·hm-2) were conducted to study the dynamic characteristics of accumulation of dry matter and nutrient of cotton plant under the background of ecology in south of Xinjiang.The result showed that the total dry matter and nitrogen accumulation of cotton are in line with the Logistic model.With the increase of nitrogen application rate,the dry matter and nitrogen uptake firstly increase,and then reach its highest value at 315 kg·hm-2 on sandy loam and 210 kg·hm-2on clay loam.The eigenvalues of the dynamic accumulation model with the nitrogen application level of 315 kg·hm-2 and 210 kg·hm-2 on sandy loam and clay loam,respectively,were more harmonious than that with other treatments.Excessive nitrogen delayed cotton maturity and increased the proportion of vegetative organs,thereby reduced their lint yield.