论文部分内容阅读
根据估产可得产量,再进行土壤测定,据以计算一季作物的氮、磷与钾的总需用量,乃是科学计量施肥中的一种重要方法.本法由著名土壤学家Truog于1960年在第七届国际土壤学会上首次提出;Ra-mamoorthy于1967年在印度小麦上面广泛推行,取得一定成果.80年代初,本法首先由上海化工院从印度文献引入国内,先后由上海、吉林、辽宁、新疆、安徽等省市推广应用;在取得大量成果的同时也发现了一些有待研究解决的问题.本法的简单原理可以从下述Stanfard式子说起.某种肥料的需用量=(一季作物的总吸收量-土壤供应量)/(肥料中该要素含量×肥料当季利用率)式中:一季作物总吸改量=产量×养分含量;肥料中某要素的含量是一个已知值,但其利用率应按试验决定,且并非常数.式中最难解决的问题乃是养分的土壤供应量;按国际惯例,是把不施该养分区的一季作物吸收量来作为土壤供应量的,但使用起来不方便.Truog对这个问题提出了巧妙的办法;他用一种已通
According to the estimated yield available, then the soil determination, the calculation of the total demand for nitrogen, phosphorus and potassium in a crop is an important method in scientific measurement of fertilization.This law by the famous soil scientist Truog in 1960 Ra-mamoorthy was widely promoted on wheat in India in 1967 and achieved certain results. In the early 1980s, this law was first introduced into the country from the Indian literature by Shanghai Chemical Industry Institute, and successively from Shanghai, Jilin , Liaoning, Xinjiang, Anhui and other provinces and cities; a large number of achievements have been made and some problems to be solved have also been found. The simple principle of this law can be described from the following Stanfard formula: The required amount of a certain fertilizer = (The total amount of crop absorption in a season - the supply of soil) / (the amount of the element in the fertilizer x the utilization of the fertilizer in the season) Where: The total amount of absorption of a crop = yield × nutrient content; However, the utilization rate should be decided experimentally and not constant. The most difficult problem in the formula is the soil nutrient supply of nutrients. According to international practice, soil It shall be measured, but not convenient to use .Truog on this issue put forward ingenious way; he has been through in a