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Research Process of Ecological Effect of Returning Straw into Field

ZHU Zi-xue et al(Department of Life Science,Zhoukou Normal University,Zhoukou,Henan 466000)  
Crop straw,which contains abundant organic substance and large numbers of elements such as N,P,K,Mg,Ca,S,etc,returned to soil would be in favor of improving physic-chemical properties of soil,enhancing soil fertility and improving crop growth.However,the ecological effect was markedly different between different treatments and sometimes had negative effect.
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