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STUDY ON ROTATION AND WATER PRODUCTIVE EFFICIENCY Analysis of Long-term Fertilization Effect on Yield of Wheat in Dry-land on Loess Plateau Effects of fertilization on soil fertility indices and yield of dry-land peanut Effects of long-term application of fertilizer on wheat nutrient uptake and soil fertility in Loess Plateau Effect of Different Nitrogen Rates on Nitrogen Absorption and Allocation of Spring Maize in Double Ridges Mulched with Plastic Film