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化肥的使用,促进了农业的发展。据测算,每投入1千克化肥(纯养分)可增产10千克粮食。但是,如果滥施化肥,则造成肥料浪费,土壤内养分比例失调,污染环境。那么,怎样合理施用化肥呢? 1.调整化肥结构,氮、磷、钾配合施用 所谓化肥结构,就是指氮、磷、钾的比例。作物的一生是按一定的比例吸收各种营养的。如每生产100千克小麦需要纯氮2.6～2.9千克,磷1～1.2千克,钾2.5～3千
The use of fertilizers has promoted the development of agriculture. It is estimated that each input 1 kg of fertilizer (pure nutrients) can increase 10 kg of food. However, if excessive use of fertilizers results in waste of fertilizers, imbalance of nutrients in the soil and pollution of the environment. So, how to rationalize the use of fertilizers? 1. To adjust the structure of fertilizers, nitrogen, phosphorus and potassium with the so-called chemical fertilizer structure, is the ratio of nitrogen, phosphorus and potassium. The life of a crop absorbs various nutrients according to a certain proportion. For example, for every 100 kg of wheat produced, 2.6 to 2.9 kg of pure nitrogen, 1 to 1.2 kg of phosphorus, 2.5 to 3 kg of potassium