不同早、中熟基因型棉花品种的干物质积累及养分吸收规律研究

利用Logistic方程对2个早熟棉品种(中36、中50)和2个中熟品种(中41、鲁28)的单株干物质积累、N、P2O5、K2O吸收动态进行模拟研究,结果表明,早熟品种与中熟品种吸收积累养分的高峰期均在开花至吐絮期。2个早熟棉品种单株干物质质量、N、K2O积累快速增长持续时间短于中熟品种,P2O5积累快速增长持续时间略长于中熟品种。早熟品种在吐絮至收获阶段,干物质积累及养分吸收占全生育期的比例高于中熟品种,成熟单株对P2O5、K2O的吸收比例高于中熟品种,在肥料配比上可适度加大磷钾肥比例。

Study on the rule of dry matter accumulation and nutrient absorption of different earliness and medium maturing genotypes cultivars of upland cotton

The field experiment was conducted to simulate the rule of dry matter accumulation,N,P2O5,K2O absorption of single cotton plant of 2 earliness cultivars of upland cotton(CRI 36,CRI 50)and 2 medium maturing cultivars(CRI 41,SCRC 28)by Logistic equation.The results showed that the faster moment of dry matter accumulation,P2O5,K2O absorption of single cotton plant of 2 earliness cultivars and 2 medium maturing cultivars of upland cotton were from full-bloom stage to opening bolls stage.The rapid growth period of dry matter accumulation,N,K2O absorption of single cotton plant of 2 earliness cultivars of upland cotton were shorter than those of 2 medium maturing cultivars,but the duration of rapid growth of P2O5absorption of single cotton plant of 2 earliness cultivars of upland cotton was much longer than those of 2 medium maturing cultivars.The proportion of dry matter accumulation and nutrients absorption from term of opening bolls to harvest of 2 earliness cultivars of upland cotton were higher than those of medium maturing cultivars,the proportion of P2O5,K2O absorption during whole growth season of 2 earliness cultivars of upland cotton were higher than those of 2 medium maturing cultivars relatively.The proportion of utilization of P and K fertilization could increase moderately in cultivation of earliness cultivars of upland cotton.