北疆高产棉花氮磷钾吸收动态的研究

A Study on High Production Cotton Colony Dynamics of Nutrient Absorbed in North Xinjiang

研究了北疆高产棉花群体（１８００ｋｇ／ｈｍ２）条件下棉株Ｎ、Ｐ２Ｏ５、Ｋ２Ｏ养分的吸收动态。结果表明，棉花茎枝、叶片、花蕾、铃壳、籽棉中的Ｎ、Ｐ２Ｏ５的百分含量随生育进程呈下降趋势；Ｋ２Ｏ含量在铃壳中呈上升趋势，在其它器官中呈下降趋势。棉株对Ｎ、Ｐ２Ｏ５、Ｋ２Ｏ的吸收均呈Ｌｏｇｉｓｔｉｃ曲线变化，养分吸收的快速增加期出现在出苗后５８～９７天，此期约吸收了养分总量的６０％，是需肥最大的时期。在本试验中，每公顷产１８００ｋｇ皮棉，从土壤中吸收Ｎ为２４５．０～２７０．１ｋｇ，Ｐ２Ｏ５为７２．４～７５．５ｋｇ，Ｋ２Ｏ为２６９．５～２７１．９ｋｇ。

The cotton was used to study the nutrient uptake of N,P 2O 5 and K 2O under the condition of high production colony(1800kg/hm 2).The results indicates that the percentage content of N,P 2O 5 in stem and branch,leaf,bud and flower,boll shell,seed cotton decreased with the growth and development of cotton plant.The content of K 2O in stem and branch,leaf,bud and flower,seed cotton decreased,but it increased in boll shell.The uptake of N,P 2O 5 and K 2O appears to Logistic curve.The rapid increasing stage of nutrient uptake was the days from 58 to 97 after emergence.And the cotton plant uptook 60% nutrient during this period.When the production of cotton reached 1800kg/hm 2,the cotton plant uptook:N was 245.0￣270.1kg,P 2O 5 was 72.4￣75.5kg,K 2O was 269.5￣271.9kg