种植方式对玉米养分吸收动态和利用效率的影响

Study on the dynamics of dry matter and nutruent accumulation in maize under various planting systems

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养分吸收动态可用Logistic方程描述。套种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。套种玉米生长前期养分吸收效率和利用效率低于单作玉米 ,生长后期套种玉米氮素利用效率高于单作玉米 ,而磷素利用效率相反。套种玉米养分吸收滞后于单作玉米 。

A field experiment was conducted to analyse the dynamics of biomass yield and N ,P ,K absorption by maize under different planting systems .Results indicated that the dynamics of biomass yield and N ,P, K absorption could be described by logistic curve equations .The maximum increase rates (MIR)of drymatter in relaycropping maize were higher than those of the single maize ,the highest absorption rates(HAR) of N,P,K in relaycropping maize were lower than those of the single maize .The time of MIR in maize was later than that of the time of HAR. The dynamics of biomass yield and N, P, K absorption in relaycropping maize was later than that of the single maize ,resulting in its lower yield .The utilization rates of N by relaycropping maize in later growth stage were higher than those of the single maize ,but the utilization rates of P were opposite .