桔园地膜覆盖土壤及树体养分状况研究

通过四年在四川盆西北地区主产脐橙及温州蜜柑的县、市,对不同土壤类型桔园所进行的秋季地膜覆盖试验表明:①有利于土壤有机质的累积,②减少土壤氮素损失;③影响土壤含水量间接影响土壤磷、钾的释放。从土壤及树体养分测定还表明,地膜覆盖有利于罗伯逊脐橙及温州蜜柑对土壤养分的吸收利用。

STUDY OF THE NUTRIENT CONDITION OF FILM MULCH SOIL AND TREE—BODY IN ORANGE ORCHARD

The experimental units of film mulch of navel orange anb Wen' Zhou mandarin at the main place of production in the northweat of sichuan in autumn, from 1986—1988,were held in different kinds of soil.The resnlts showed that film mulch helped the accumulation of organism, diminished the loss of nitrogen. By adjusting the water content, the amount of effective P and K was obxiously higher in the field. With film mulch, it was also advantageous for Robertson navel orange and wenzhou mandarin to absorb and utilize the N,P, and K in soil. In this trial condition of soil organism; can discreat the lose Nitrogen, Phosphorus and Kalium indicatly by adjusting the water content in field, the content of effective P, K in wet soil is bighter the dry obviously. In the other hand, the analysis shows, film mulch is also advantgeous for Robertson navel orange and Wen'zhou mandarin to absorb and utilize the N, P and K in soil.