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有经验的农民,根据队里的粪堆大小可以估算出当年能打多少粮食,还可以根据计划产量指标提出该上多少粪肥.这就是我们所说的以肥定产和按产定肥的基本概念.要真正做到以肥定产和按产定肥,要使施肥计量化,必须深入研究些问题.首先,必须了解各种农作物需要什么养料和需要多少养料.到目前为止,已知农作物的必需营养元素有16种,而氮、磷、钾三要素土壤里最缺,供应也紧张.一些农作物所需三要素的数量如下表.
Experienced peasants, according to the size of the team’s dung heap can estimate how much food can be played that year, but also according to the planned output index put on the number of manure on .This is what we call a fertilizer production and fertilizer by the basic Concept .To really make fertilizer production and fertilizer according to production, in order to make fertilizer measurement, we must in-depth study of these problems.First, we must understand what kind of crops need to feed and how much nourishment.So far, known crops There are 16 kinds of essential nutrients, while nitrogen, phosphorus and potassium are the three most important elements in the soil, and the supply is also tight. The quantities of the three elements required for some crops are shown in the following table.