Scientific application of controlled-release fertilizer

With the popularization of slow and controlled release fertilizers, farmers have vividly called the "controlled fertilizers" of "multicolored clothes" as "smart fertilizers" and "fools." However, it is not easy to use slow and controlled release fertilizers to save time, increase production, increase income, and reduce labor. Experts advise that the use of slow-release fertilizer must be scientific and appropriate.

Type selection There are several types of controlled-release fertilizers according to different controlled-release periods and different nutrient contents. Different controlled-release periods mainly correspond to the length of the growing period of the crop. Different nutrient contents mainly correspond to the amount of fertilizer required by different crops, so it must be targeted. Choose to apply. Like corn, a controlled release period of three months is generally appropriate, and nutrient content should be selected according to local conditions.

The controlled-release fertilizer must be used as a base fertilizer or a top-dressing fertilizer during the application period, that is, when the crop is sown or during the seedling growth period after sowing. Like corn, it can be applied at the time of sowing, and it can also be applied before the seedlings are six leaves, and it is not suitable to apply it later.

The amount of application of the amount of its application must first take into account the nutrient type, content and its proportion of coated controlled-release fertilizer. For example, a blended fertilizer contains only 30% of sulfur-coated urea, and the other 70% is a conventional quick-release compound fertilizer. If the application can reduce the 1/3 application amount, the fertilizer application amount can only reduce 30% of the coated urea. The amount of 1/3 nitrogen is only about 10% less than conventional. At the same time, the application of slow-release fertilizers should be determined based on comprehensive consideration of the target crop yield, soil fertility, and fertilizer nutrient content. If the target yield of the crop is high, the amount of fertilizer should be increased accordingly.

Application methods There are many problems in the application of slow and controlled release fertilizers, mainly in the mixed application of seed fertilizer or seed (root) fertilizer is too close, resulting in burning root and burn seedling phenomenon; Or the controlled-release fertilizers will be spread and flushed so that the slow-release fertilizers cannot fully exert the fertilizer effect. Application of slow and controlled release fertilizer to achieve isolation of seed fertilizer, ditch (bar) application of soil, like corn, cotton and other general requirements of seed and fertilizer spacing distance of 8 to 10 cm, applied to the depth of soil in about 10 cm.

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