Urea and ammonium bicarbonate are commonly used nitrogen fertilizers. They should be applied as top dressings by applying furrows or acupuncture points, with a depth of 5-10 cm and covered with earth.
Calcium, magnesium, phosphate fertilizer is not easy to dissolve in water, and the fertilizer effect is slow. It is good to use as a base fertilizer and organic fertilizer, and it is less effective and less effective when used as top dressing.
Superphosphate is highly corrosive and should be applied as a top dressing with deep furrows; seed fertilizers should be applied 5-6 cm below or to the side of the seeds and the fertilizer should be separated from the seeds by soil. Superphosphate should not be directly seeded.
The potassium fertilizers used in agricultural production are mainly potassium sulfate and potassium chloride, both of which are water-soluble fast-acting fertilizers with weak physiological and acidic reactions. After being applied to soil alone, potassium ions are easily absorbed, fixed, and removed by cations in soil colloids. Crops are difficult to use. Therefore, it should not be applied alone. It should be combined with nitrogen and phosphate fertilizers. Potassium fertilizer for top dressing should be concentrated or applied.
There is an adverse effect between zinc and phosphorus, such as the combination of zinc sulfate and superphosphate, which will inhibit the efficiency of zinc sulfate. Therefore, the two should not be mixed.
The borax was sprayed after dissolving in boiling water. Cold water is often used to dissolve borax in production. This is wrong. Borax will quickly recrystallize in cold water, causing borax to precipitate in solution and lose its effectiveness. The correct method is to put borax into a hot water bottle first, add boiling water to dissolve it, close the bottle stopper and bring it to the field, and then chill the water to the desired concentration.
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