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pro vyhledávání: '"陈庆华 Chen Qinghua"'
Publikováno v:
Acta Ecologica Sinica. 32:1854-1860
The manner of straw returning is a double-edged sword for cropland ecosystems because it can not only return nutrients for crop,enhance the soil fertility and lessen the use of chemical manures correspondingly,but also it may result in nonpoint sourc