内蒙武川旱农试验区栗钙土养分肥力的表征

讨论用土壤氮矿化势与磷、钾养分含量表征试区栗钙土的养分肥力,提出 N_0(土壤氮矿化势)和 N_(t=12)(作物主要生长期矿质氮素累积量)作为试区栗钙土氮肥力和当年可供给的氮养分指标。结果表明,土壤养分肥力随坡地高程增加而递减,并由南向北递减。土壤肥力贪瘠,三要素比例不协调,生产效应很低,常年产量在50 kg 以下。合理施肥,氮肥是关键;氮、磷肥料配合施用效果较好,能促进提高土壤中贮量丰富的钾利用率与增加土壤养分肥力的生产效应。

THE EXPRESSION OF THE NUTRIENT FERTILITY OF CASTANOZEM IN DRYING FARMING EXPERIMENTAL DISTRICT IN WU CHUAN INNER MONGOLIA AUTONOMOUS REGION

This article discusses the nutrient fertility of Castanozemin the experimental district with the aid of soil nitrogen mineralizaties power and the manifestation of P,K content.That shows that the soil fertility may reduce acco- rding with the increase of the altitude of the sloping field and also recrease from the north to the south.The natural productive effect may be very low if its fertility is poor and the proportion of three main fertilizer components are not coordinated.Nitrogen fertilizer is the key ...