Based on 20 years of long-term experiment of applying fertilizer on continuous wheat in dry-land of Loess Plateau.Wheat yield,nutrient uptake and soil nutrient were analyzed in year 2005.The results showed that yield was increased by 25.6% and 48.1% with single application of P and N fertilizer,respectively.The N and P uptake was increased too,but the harvest index was decreased.The combination of N and P could increase yield by 101.3%-302.8% and nutrient uptake significantly.Soil nutrient content in surfac...
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