This is largely because of reductions in fertiliser use and the amount of nitrogen leaching from manure.
这是相当大的一部分，因为可以减少施肥和从动物粪便中滤出的氮。
Applying more nitrogen would increase the content of soil microbial biomass nitrogen, but might result in large amount of nitrate residue in soil and suspected to leaching loss.
继续增加施氮量，土壤微生物量氮含量增加，但土壤中残留大量硝态氮，易淋溶损失。
应用推荐