1. 911chaxun查询·英语单词
1. 水作及早作后，免耕土壤有机质、全氮、速效氮、速效磷、速效钾均在土层中呈明显表集现象。 The surface (0-5cm) gathering phenomenon of organic matter, total nitrogen, available nitrogen, available phosphorus, and available potassium was obvious in the no-tillage soil.