Study on the relationship between soil nutrient and spring wheat yield and optimum fertilization

The relationship between soil nutrient and spring wheat yield and optimum fertilization are studied．The results show that the yield and soil nutrient have a close relationship，especially the nutrients of soil organic and Hydrolysis N，but the effects of available P and available K are not very significant．There is a lack of N in particular，P in partial and K is very rich in soil．These results are in a good fit with the yield-nutrient sensitivity．The optimum fertilization of N is cut down 10％ than norma1．P is cut down 15％．