南疆棉花干物质和氮磷钾养分积累的模拟分析

Simulating the Dynamics of Dry Matter and N,P_2O_5,K_2O Accumulation of Cotton in South Xinjiang

分析了南疆棉花的干物质和氮磷钾养分的积累规律 ,它们均呈“S”型曲线 ,可用 Logistic生长函数加以模拟 ,效果良好 ,曲线相关指数 R2 均在 0 .98以上。棉株总干物质和生殖器官干物质积累速率最快的时刻在出苗后的 86～ 93 d和 99～ 1 0 0 d;棉花对 N、P2 O5、K2 O养分吸收强度最大的时刻分别在出苗后的 73～ 80d,72～ 76d和 65～ 76d。南疆高产棉花 (2 2 5 6kg/hm2 )地上部总干物质和生殖器官干物质积累量分别为1 1 8.69g/株和 69.3 3 g/株 ,吸收积累的 N、P2 O5、K2 O养分为 :2 63 .890、68.63 5和 3 3 4.72 5 kg/hm2 。N∶ P2 O5∶K2 O=1∶ 0 .2 6∶ 1 .2

The dry matter and N,P 2O 5,K 2O accumulation of cotton were studied in South Xinjiang. The results showed that the dry matter and N,P 2O 5,K 2O accumulation were 'S' type curves, and could be fined to the Logistic equation, these correlation coefficent( R 2) were over 0.98. The cotton total dry matter and reproductive organs dry matter accumulation rates were fastest at 86～93 days and 99～100 days after sprout. The nutrient N accumulation rates were fastest at 73～80 days after sprout. The nutrient P 2O 5, accumulation rates were fastest at 72～76 days after sprout. The nutrient K 2O avvumulation rates were fastest at 65～76 days after sprout The accumulation of the aboveground part and the reproductive organs dry matter of high yield cotton(2 256 kg/hm 2) are 118.69,69.33 g/plant. The accumulations of nutrient N,P 2O 5,K 2O are 263.890, 68.635,334.725 kg/hm 2. and N∶P 2O 5∶K 2O=1∶0.26∶1.27.