不同施氮水平棉花氮磷钾养分吸收规律研究

目的]研究不同施氮量条件下棉花植株对氮、磷、钾养分的吸收规律.方法]采用纯氮单因子随机区组设计,设6个施氮处理.取样株测定各器官的氮、磷、钾养分吸收量.结果]产量水平最高的N_2处理棉花植株氮、磷、钾积累的旺盛时期分别出现在播种后的54～110 d、57～120 d、44～89 d,比其它处理出现的早而且持续的时间长;棉花最高籽棉产量的施氮量为348.32 kg/hm~2,经济施氮量为320.46 kg/hm~2.结论]各处理棉花植株氮、磷、钾养分积累量均呈现苗期积累小,蕾期迅速增大,花铃期达到高峰,吐絮期又有所减小的趋势.

Study on Absorption Law of Nitrogen,Phoshorus and Potassium of Cotton Plant under Different Nitrogen Application Rate

Objective and Method]The purpose of this research was to reveal the absorption law of nitrogen,phosphorus and potassium nutrient by cotton plant under different nitrogen fertilizer rate.Result and Conclusion]The results demonstrated that when there was minimum accumulation of nitrogen,phosphorus and potssium of cotton plant with different treatments in the seedling stage of cotton,it was increased in bud stage,it reached a peak in flower bolling stage,but it was decreased in boll opening state.Among all the treatments,the productive period of accumulation of nitrogen,phosphorus and potassium treated with N_2 was the longest,which reached 54-100 d,57-120 d,44-89 d,respectively after sowing,which was earlier and longer than that of other treatments.The nitrogen fertilizer rate of the highest seed cotton yield was 348.32 kg/hm~2,the economic nitrogen fertilizer rate was 320.46 kg/hm~2.