小麦磷二铵最佳用量及其与土壤植株养分关系的初探

Preliminary Studies on Relationship between Optimum Diammonium Phosphate Application of Wheat and Soil or Plant Nutrients

This paper pointed out the optimum diammonium Phosphate applied amount of wheat plant in fertile soil and also described its relation to soil and plant nutrient. The results indicated that:the phosphate was rich in the soil,the evidence obtained appeared to fit the law of diminishing returns.The applied amount of diatomalum phosphate for maximum yield was approx- Imately 30kg/mu.Under given soil and producing conditions,the optimum amount applied depended on the price ratio(fertilizer/wheat).When the ratio ranging from 2.6 to 2.0,the optimum applied amount of diammonium phosphate was 12-15kg/mu.As the rates of diammonium phosphate increa- sed,the content of soil available phosphate increased,the soil available N.K arid Cu decreased significantly,and the total N,K,Cu and Zn in plant increased significantly.