关键词: 土壤, 土壤, 磺胺类兽药, 生态效应, 转归

Abstract:

The aim was to provide basis for reasonable fertilization and prevention of widespread pollution. The corn was used as samples, the characteristic of nutrients downward movement in profile and crop yield response on red soil dry lands of a long-term Fertilization were studied with 4 treatments. The results showed that long-term application of N, P and M fertilizers significantly increased 0-20 cm nitrogen, available phosphorus, potassium and organic matter content; but only application of NP fertilizer or NM fertilizer significantly reduced 20-60 cm nitrogen content, 60-80 cm had smaller differences in nitrogen content. The MP treatment reduced the 20-40 cm available phosphorus content, but 40-60 cm had few differences; 40 cm and the following was not obviously differences in potassium content; 60-80 cm had no differences in organic matter content. After 28 years amending and fertilizing of low-yielding red soil, production performance had reached the upper level of fertility. No yield in N treatment since the eighth years, in NP treatment since the 21th years. The maize yield in NMP treatment was higher than that of NP treatment.