But scientists at Delaware State University have found that an ancient method of fertilizing soil may help.
不过特拉华大学的科学家们发现一种古老的方式或许对增加土壤肥沃有效。
This method of fertilizing can be used in the cold region in North China.
可作为北方寒地稻作区的施肥技术。
This method was more reasonable than that only using soil available s as the standard of fertilizing recommendation.
田间试验表明这一确定施硫量的方法是可行的，该方法比单纯用土壤速效硫含量确定的田间施硫量更合理。
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