The techniques of water storage and fertilizer accumulation, consi ering the characteristics of large area, shallow topsoil layer, poor nutrients and low and unstable yields, suggest to utilize the abandant natural organic matter resources such as yong tree breaches,green grass and crop stalks, to take the soils improvement measures of digging trenches along the contour lines with organic matters burried so as to thicken the topsoil layer, improve the soil structure and increase the capacity of water s...
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