Effects of Long-Term Fertilization on Calcareous Cinnamon Soil Fertility and Crop Yield of Northern China Plain

This study used a long-term experiment to research the effects of long-term fertilization on cinnamon soil fertility and crop yield of Northern China Plain. The results showed that the soil applied N alone still holded high NO3 -- N after wheat harvesting, the followed arrival of the rainy season will increase the environmental risk of pollution to groundwater. Application of phosphate fertilizer and potassium fertilizer increased the soil content of available P and K significantly. Continuously applied fertilizer without phosphorus or potassium, the soil had a serious depletion of P or K. Application of zinc fertilizer had soil available zinc content increased significantly. In order to increase yield, maintain soil fertility, and protect environment, Applied Nitrogen with phosphorous and potassium is the best choice in the northern China plain.