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Effect of Seed Soaking in Plant Hormone and Trace Element Fertilizer on the Growth of Psoralea corylifolia L. Studies on the Cause of Leaf Yellowing of Amomum villosum Lout. from Yunnan and Its Prevention Effect of Spraying Trace Element Fertilizers at Different Levels on Alfalfa Quality in Arid and Semiarid Areas of Northwestern China Increasing yield effects of applying trace element fertilizers to agricultural crops in the nterlaced urea of agriculture and pasture-A case study from Duolun County，Inner Mongolia Autonomous region