Application of Biological Nitrogen Fixating Techniques in Returning Plowland to Pasture and Forest.
生物固氮技术在退耕还林还草中的应用。
On common cultivation practices on sloping plowland for water and soil conservation
坡耕地水土保持主要耕作措施研究
As result, the plowland are decreasing and the contradiction between plowland and human is intensifying.
相应地，耕地面积逐渐减少，人地矛盾日益突出。
The new plowland they digged up is over five thousand ha.
他们新开垦的耕地面积达五千公顷。
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