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为了提高产量或者是使已经高产的保持高产,都必须选择合理的肥料品种和合理的用量,所以,研究各种作物不同产量水平的施肥量具有极其重要的意义。作物一生所需之氮、磷、钾量可由作物成熟时氮、磷、钾含量计算得出。以小麦所需氮素为例,籽粒含氮约为2%,麦草含氮约为0.4%,而两者重量比为1:2,那末每生产100斤小麦,则需吸收纯氮约2.8斤。以此类推,可算出其它作物的吸收量。如表1,这种用测定作物收获期某种元素含量百分数乘以亩产量而估算施肥量的方法称为“建议量”法。
In order to increase the yield or keep the high yield, we must choose a reasonable variety of fertilizer and a reasonable amount of fertilizer. Therefore, it is extremely important to study the amount of fertilizer applied to different crop yield levels. The amount of nitrogen, phosphorus, and potassium required for a crop’s life can be calculated from the nitrogen, phosphorus and potassium contents of crops as they mature. Taking the required nitrogen for wheat as an example, the nitrogen content of grain is about 2%, the nitrogen content of wheat straw is about 0.4%, and the weight ratio of the two is 1: 2. Then for every 100 kg of wheat produced, about 2.8 kg . And so on, can calculate the absorption of other crops. As shown in Table 1, this method of estimating the amount of fertilizer by multiplying the percentage of a certain elemental content at the harvest stage of a crop by the yield per acre is called the “recommended amount” method.