不同种植方式下玉米干物质积累、养分吸收动态特点的研究

Studies on Dynamics of Dry Matter and Nutrient Accumulation in Maize under Various Planting Methods

采用田间小区试验方法研究了不同种植方式下玉米产量,干物质积累动态和养分吸收动态变化特点。结果表明:不同种植方式下玉米的干物质积累与养分吸收动态可用Logistic方程描述。套种玉米干物质积累最大速率高于单作玉米,养分吸收最大速率低于单作玉米,养分吸收最大速率出现日期比干物质最大积累速率出现日期早。套种玉米干物质积累与养分吸收均滞后于单作玉米,是套种玉米产量降低的主要原因。

A field experiment was conducted to analyse the dynamics of biomass yield and N,P,K absorption by maize under different planting ways.The results indicated that the dynamass of biomass yield and N,P,K absorption could be described by logistic curve equation.The maximum increase rations (MIR)of dry matter on relaycropping maize were higher than that of the single maize,the highest absorption rations(HAR) of N,P,K on relaycropping maize were lower than that of the single maize.The time of MIR on maize were later than the time of HAR.The dynamics of biomass yield and N,P,K absorption on relaycropping maize were later than that of the single maize,resulting in lower yield.