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旱地土质薄、产量低,如何加速培肥地力是夺取高产的重要问题。当前培肥地力,仅靠农田范围内的物质循环很难达到目的。必须投入适当的化肥以便提高产量和增加有
The dry land is thin and the output is low. How to speed up the fertilization is an important issue to seize high yield. At present, the fertility of fertilizers can not be achieved by the material cycle in the field of farmland alone. Fertilizers must be put in order to increase production and increase there