"Three essentials" for scientific application of flush fertilization

In recent years, with the gradual reduction of the amount of chemical fertilizer application, flush fertilization has been welcomed by farmers due to its simple usage, easy absorption of crops, and good fertilizer efficiency. It has been widely used in protected greenhouses. Got good results. Recently, Liu Cunshou, a professor at the College of Resources and Environmental Management of Northwest A & F University, said in an interview with reporters that fertilizing is by no means as simple as "fertilizing with water and flushing". Different fertilizing varieties have different characteristics and different application techniques. The application principle is basically the same as that of soil topdressing. In addition to water application, deep soil application and concentrated application are also emphasized.

The type of fertilizer must be appropriate. For example, when soil nitrogen supply is insufficient and green leafy vegetables that require more nitrogen are planted, urea or ammonium nitrate can be used; if nitrogen, phosphorus, and potassium are lacking, ternary compound fertilizers or potassium dihydrogen phosphate and phosphoric acid can be used. Diammonium and other fertilizers.

Appropriate application method. Before applying flush fertilization, the solid chemical fertilizer should be hydrated to make a mother liquor, and then flushed with water. If solid organic fertilizer is used, it should be soaked about 10 days in advance, and the juice will be washed with water after it is ripened. Many farmers' friends directly sprinkled solid fertilizer into the field, and then irrigated it with water, which caused uneven distribution of fertilizer in the field. Crops were harmed where the fertilizer concentration was too high, and crops where the fertilizer concentration was too low could not meet the needs of the crop. At the same time, such use also causes a great waste of fertilizer.

Dosage and concentration should be reasonable. If the amount is too large and the concentration is too high, it is easy to produce toxic gases such as ammonia, nitrogen oxide, and hydrogen sulfide, which will cause crop poisoning. If the amount is too small and the concentration is too low, it cannot meet the needs of the crop and cannot achieve the purpose of increasing yield. In normal normal irrigation, the amount of solid fertilizer used per unit area can be used within a reasonable range of conventional soil topdressing. For the special-purpose fertilizing fertilizers sold in the market, they should be used according to the attached instructions, and should not be used arbitrarily, so as not to affect the effect and cause unnecessary losses.

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