土壤中的养分除氮外, 最初的来源都是母岩.The nutrient in soil divides nitrogen outside, prime source is Mu Yan.另外,还简略介绍了生物除氮磷的基础理论.It also summarizes basic principles on biological nitrogen and phosphorous asas some new significant views....

“除氮”的英语可以翻译为：denitrogenate ...