地膜覆盖、氮肥与密度及其互作对黄土旱塬春玉米氮素吸收、转运及生产效率的影响
Effects of Film Mulching, Nitrogen Fertilizer, Plant Density and Its Interaction on Nitrogen Accumulation, Translocation and Production Efficiency of Spring Maize on Dryland of Loess Plateau
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