The multi technical systems for steady and high yield of basic croplands in Yan er watershed were discussed. After tested and demonstrated for 3 years in Yan er watershed, the implement ratio of food yield potential changed from 23%~48% to 54%~64% in general croplands. In general, the mean yield per unit and water use efficiency increased by 63% and 59.1%. Additionally, the total yields increased by 33.7% ~62.1% over in 1997 and per person produces over 500kg food, so the effects come true for cropla...
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