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

研究结果表明,在高磷条件下,磷二铵的增产效果符合报酬递减率;最高产量点的施肥量在30公斤/亩左右;最佳施用量在一定的土壤及生产条件下因肥料价格/小麦价格的比值而异,该比值在2.6—2.0范围内,最佳施用量为12—15.5公斤/亩.土壤速效磷随磷二铵用量增加而提高;而土壤速效 N,K,Cu 则显著降低;植株体内 N,K,Cu,Zn 含量随磷二铵用量增加而明显增加。

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.