华北冬绿肥作物二月兰的营养特征研究

二月兰可作为冬季绿肥作物引入华北地区农田种植,与春玉米等作物形成良好的粮肥复种体系,在华北地区有着广阔前景.本试验调查分析了二月兰从返青到成熟的养分含量及累积状况,结果表明,二月兰植株体的养分含量较高,盛花期其干物质氮、磷、钾含量分别为2.99％、0.42％和2.99％,且产量较高.二月兰对氮、钾的累积量大,对磷的累积量较小.盛花期二月兰的养分已累计完成了总量的86.3％～94.0％,是进行翻压的最适宜时期.二月兰的养分累积过程符合Logistic方程y=k/(1 +ae-bx),氮、磷、钾最大累积速率出现的先后顺序为磷最早、氮次之、钾最晚.

Nutritional characteristics of Orychophragmus violaceus in North China

Orychophragmus violaceus can be used as winter green manure in North China,forming a good food-manure cropping system with spring maize.This experiment investigated nutrient contents and accumulations of Orychophragmus violaceus from returning green to maturity.Results showed that the nutrient contents of Orychophragmus violaceus were high.At full flowering stage,the contents of N,P and K were 2.96%,0.42%and 2.75%respectively.The accumulation amounts of N and K were large,but P was small.The plant had accumulated 86.3%~94.0%of total nutrient accumulations by full flowering stage,which was the most suitable incorporation time.The change of nutrient accumulation could be described by Logistic equation y=k/(1+ae-bx),showing that the appearance time of highest P absorption rate was earlier than that of N,while that of K was the latest.