氮钾互作对春玉米养分吸收动态及模式的影响

采用田间试验与植株分析等方法研究了不同氮钾配比下春玉米养分吸收动态及模式，结果表明，不同氮钾配比下春玉米氮磷钾绝对量的积累均符合Logistic方程，肥料用量与比例可明显影响到玉米养分吸收最大速率及其出现日期。用量及比例适宜可获得较高的养分最大吸收速率，且其最大速率出现日期相对较早；玉米氮素最大吸收速率出现在中后期，应注意氮肥的分次施用。每生产100kg玉米子粒，适宜氮(N)、磷(P)、钾(K)的吸收量分别为1.954、0.376和1.390kg。植株养分吸收适宜比例为1:0.19:0.71。

Dynamics and Models of N,P and K Absorption by Spring Maize as Influenced by Nitrogen and Potassium Interaction

The accumulation process of nitrogen,phosphorous(P)and pltassium in spring maize plants under different ratios of N to K could be described by Logistic curve equation.The highest nutrients absorption rates(HAR)and the time of HAR occurring were obviously influenced by different ratios of N to K.High HAR and its early occurring could be achieved with the rational ratio of N to K.The HAR of N occurred in middle-later gotwing stage,indicating that a split application of N is needed to improve Nutlizatiou rate.The amount of N,P and k required for the production of 100 kg maize grain were 1.954kg,0.376kg.The rational ratio of N:P:K absorbed by maize was 1:0.19:0.71.