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A safe, high fertilizer-efficiency and economical approach based on a low-volume spraying UAV loaded with chelated-zinc fertilizer to produce zinc-biofortified rice grains

Chelated-zinc FertilizerCrop ProductionPrecision AgricultureEngineeringEnvironmental EngineeringSustainable AgricultureAgricultural EconomicsLow-volume Spraying UavPublic HealthSoil FertilityHigh Fertilizer-efficiencyNutrient Management