Based on practice of constructing ecological agriculture at Zhifang valley and Yangou watershed, the process and effect of returning slop farmland to woodland or grassland, shifting extensive farm mode to advance productivity of farmland was discussed in this paper. At Zhifang valley, the yield per unit area had increased near 2 times in 10 years through returning farmland to woodland step by step. At Yangou watershed, the yield per unit area had increased 1.7 times in 3 year (1998-2000), and had realized...
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