氮钾互作对春玉米生物产量及其组分动态的影响

采用田间小区试验方法研究了不同氮钾配比下春玉米生物产量及其组分动态。结果表明,不同氮钾配比下春玉米总生物量及粒重的增长均符合Logistic方程;营养体干重随时间的变化符合回归方程Y=axe^bx;生物产量依子粒产量和营养体干重变化符合回归方程Y=exp(a+b₁x₁+b₂x₂)。适宜的氮钾配比及施肥技术促进玉米植株生育前期总生物量的积累以及生育后期干物质从营养体向子粒的转移,从而获得较高的子粒产量。

Dynamics of Biomass and its Components of Spring Maize as Affected by Nitrogen and Potassium Interaction

Field trial was conducted to analyze the dynamisc of biomass yield and its components (grain and vegetative yield)of spring maize under different ratios of nitrogen to potassium.The results indicated that the dynamic changes of total bio-mass and grain weight in maize under different ratio of nitregen and potassium could be described by Logistic curve equation,and that of grain yield(X₁)and vegetative yield(X₂),as described by regression equation of Y=exp(a+b₁x₁+b₂x₂).The increasing duration and increasing rate of bio-mass yield and grain weight,and the increasing duration of vegetative yield and its decreasing rate were obviously influenced by different ratios of N to K.Rational ratio of N to K and their appropriate application rate did not only accelerate the accumulation of total bio-mass in earlier growth stage,but also stimulated the rapid transformation of vegetative dry matter to grain in later growth stage,resulting in high grain yields.