研究施钾和秸秆还田对华北地区不同种植制度下作物产量和耕层土壤钾素状况的影响。
Effect of application of K fertilizer and wheat straw to soil on crop yield and status of soil K in plough layer under different planting systems was studied.
对1994-1996年和2001-2002年坡地不同种植制度与地表径流的相互关系进行了探讨。
The connection between different plant systems and runoff from sloping fields was studied and discussed for the periods 1994-1996 and 2001-2002.
对1994-1996年和2001-2002年坡地不同种植制度与地表径流的相互关系进行了探讨。
The connection between different plant systems and runoff from sloping fields was studied and discussed for the periods 1994-1996 and 2001-2002.
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