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Effects of optimum nutrient management on nutrient uptake and utilization of winter wheat in North China Plain Effects of Nitrogen Fertilization Application Regime on Dry Matter, Nitrogen Accumulation and Transportation in Summer Maize under Waterlogging at the Seedling Stage Effects of Fruit Load on Absorption，Distribution and Utilization of N in the Dwarf Apple Effects of Fruit Load on Absorption，Distribution and Utilization of N in the Dwarf Apple