不同肥力黄绵土在施肥条件下的土壤供N、P能力和N、P肥的效应

Soil Supplying N, P Capacity and N, P Fertilizers Effect of Loessal Soil in Different Fertility under Fertilization Condition

经过６年长期施用不同肥料定位试验，使其同一土壤形成肥力上的差异。在此土壤上，进行盆栽试验，分析和研究了不同基础肥力土壤供肥能力，以及施用Ｎ、Ｐ肥的增产效应和作物吸Ｎ、Ｐ量的反映。结果表明，基础肥力以施ＭＮＰ肥土壤供Ｎ、Ｐ能力最强，其次为施ＭＰ肥处理，单施Ｎ肥土壤供Ｎ、Ｐ能力最差。

The located experiments supplying different fertilizers for six years result in fertility dif-ference in the same soil,we conduct pot experiment,in soils of different fertility,and analyse andstudy soil supplying nutrient capacity and yield- increasing effect under supplying different fertiliz-ers as well as uptake N,P contents by plant. The results show that the soil supplying N,P capacityof fertilizing MNP is the best,that of fertilizing MP is the second,that of fertilizing N is the worst.