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一般情况下,测土配方施肥表采用的推荐施肥量是纯氮、P2O5(五氧化二磷)、K2O(氧化钾)的用量。但由于各种化肥的有效含量不同,所以农民在实际生产过程中不易准确地把握用肥量。以下是—种较为简便计算施入土壤中的化肥量的方法。假设该地块推荐用肥量为每亩纯氮8.5公斤、P2O54.5公斤、K2O6.5公斤。单项施肥。其计算方式为:推荐施肥量÷化肥的有效含量=应施肥数量。可得如下结果:施入尿素(尿素含氮量一般46%)为8.5÷46%=18.5 (公斤)。
In general, the recommended amount of fertilizer used in soil testing and fertilizer table is the amount of pure nitrogen, P2O5 (phosphorus pentoxide), K2O (potassium oxide). However, due to the effective content of various fertilizers is different, so farmers in the actual production process is not easy to accurately grasp the amount of fertilizer. The following is a simpler way of calculating the amount of fertilizer applied to the soil. It is assumed that the fertilizer recommended for this plot is 8.5 kg of pure nitrogen per mu, P2O54.5 kg and K2O 6.5 kg. Single fertilizer. The calculation method is: recommended amount of fertilizer ÷ effective amount of fertilizer = should be the amount of fertilizer. The following results were obtained: Urea application (46% of the urea nitrogen content) was 8.5 ÷ 46% = 18.5 (kg).