摘要： 采用微区模拟方法,研究了免耕条件下,玉米田土壤硝态氮、速效磷和速效钾含量的动态变化。结果表明:与常规耕作相比,玉米田免耕降低了土壤硝态氮、速效磷和速效钾三种养分含量。其中对土壤硝态氮含量影响最大,降低达显著水平;速效磷含量次之;对速效钾含量影响最小。0~20 cm土壤硝态氮含量免耕处理比翻耕处理低15.3%~51.2%。20~40 cm土壤硝态氮含量,免耕处理比翻耕处理低40.9%~46.7%。

关键词: 免耕, 玉米, 土壤养分, 动态变化

Abstract: The content of nitrate-N, available-P₂O₅ and available-K₂O in the soil under no-tillage maize cropping through microplot trial was studied. The result showed that the content of soil nitrate-N, available P₂O₅ and available K₂O decreased under no-tillage condition compared with conventionanl tillage. Among these, the content of soi lnitrate-N was most significant ly affeted. The content of available P₂O₅was affected secondly. The least affeted nutrition was available K₂O. The content of soil nitrate-N under no-tillage was 15.3%- 51.2% lower than that of the conventional tillage in 0- 20 cm, and 4019%- 4617% lower in 20- 40 cm.

Key words: No-tillage, Maize, Soil nutrition

中图分类号: 

• S513