Corn fertilization must be seen five

A look at the nature of the soil. Low-lying land and saline-alkali land should use acidic fertilizers such as ammonium nitrate, ammonium sulfate and superphosphate; acidic soil should use alkaline fertilizers such as urea and ammonium bicarbonate; for sandy land with poor water retention and fertilizer retention, non-volatile sentic acid should be used. Fertilizers such as ammonium or urea.
Second, look at the characteristics of fertilizer. Shallow application, clear application or water application should be avoided to avoid waste caused by loss of fertilizer efficiency.
Three to see the need. Young seedlings with 6~7 leaves should be applied with coarse fertilizer to induce early roots of tiger roots; fertilizer should be applied at jointing stage, accounting for 30%~40% of topdressing amount; fertilizer amount should be aggravated at booting stage, accounting for total fertilization The amount of 50%~60%; the amount of nitrogen applied in the early stage, the foliar fertilizer in the middle stage, and the potassium dihydrogen phosphate in the seeding stage.
Fourth, look at the growth. The strong seedlings can be applied with chemical fertilizers; in addition to the chemical fertilizers, the weak seedlings should also be followed by the fertilized manure and cake fertilizer; the weak seedlings in the strong seedlings should be eaten more and more fertilized to make the weak seedlings stronger. After fertilization, deep tillage is required to cover the soil.
Five to see the law of birth. In the seedling stage, fertilization is not too early, so that the seedlings can be fertilized; the fertilization in the male and female ear formation period is not late, to prevent the emergence of old seedlings; in the late stage, the appropriate amount of topdressing and prevention of early attenuation.
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