不同碳氮比肥料组合对肥料氮生物固定、释放及小麦生长的影响

Effects of different C/N combinations of fertilizers on biological fixation and release of nitrogen fertilizer and wheat growt

摘要: 采用室内模拟试验与盆栽试验相结合的方法，研究了不同C、N比肥料组合(玉米秸秆+尿素)对肥料N生物固定、释放及小麦生长的影响。结果表明：肥料组合的C、N比越高，土壤微生物对肥料N的固定量越大，但其释放率逐渐降低；肥料组合的C、N比越高，对土壤NO^-₃-N的抑制作用越大；麦田玉米秸秆还田时，调整其C/N≤20为宜。

Abstract: The incubation experiment and pot experiment were conducted to study the effects of different C/N combinations of fertilizers(corn straw+urea)on biological fixation and release of nitrogen fertilizer and wheat growth.The results show that the biological nitrogen fixation is improved with the increase of C/N ratio.But the releasing rate of microbial biomass nitrogen decreases gradually.With the increase of C/N ratio of fertilizer combination,the restraint to nitrate nitrogen in soil becomes stronger.When corn straw is applied to wheat field,the C/N≤20 is suitable for the growth of wheat.