彩色棉干物质积累和养分吸收的模拟分析

彩色棉干物质积累和养分吸收均按logistic曲线变化,在快增期较短的时间内积累和吸收了约60%的干物质和养分,是彩色棉产量和品质形成的重要时期。彩色棉的干物质积累和养分吸收量在各时期低于对照白棉,且干物质最大积累强度出现的时间以及干物质积累进入快增期出现的时间上比对照均有所后延。彩色棉比对照有较弱的氮素吸收能力,棕色棉对钾素和磷素有较强的吸收能力,绿色棉的吸收能力相对较弱。最大养分吸收强度各品种均是钾最大,其次是氮,磷的吸收最少。彩色棉对氮、磷、钾养分的吸收量与干物质积累量和光合器官高度正相关。采取相应的栽培措施提高彩色棉养分和干物质在各生育时期的吸收、积累,并及时地向生殖器官较多的转移是其获得高产的物质基础。

Analysis on Simulation Model of Dry Matter Accumulation and Nutrient Absorption of Coloured Cotton

The dry matter accumulation and nutrient absorption of coloured cotton accord with logistic curve and show the change rule of slow - quick-slow. During the quickly increasing period, about 60% nutrients and dry matter are absorbed and accumulated. But the dry matter accumulation and nutrient absorption of coloured cotton are lower than the CK in every stages,and the time when they go into the most quickly increasing period are latter than the CK too. Coloured cotton has less ability of absorption of N than CK, the green cotton has less ability of absorption than CK and grown cotton. For every cottons,the maximum intensity of absorption is K2O, then is N and P2O5 ,and the absorption of N, P2O5, K2O is high correlation with the dry matter accumulation and leaf area.