Misunderstanding 1: Imported is better than domestically produced. "Imported is better than domestically produced." This view is incorrect. First of all, it is not ruled out that some foreign fertilizers are indeed effective, but domestically produced fertilizers are also good. You cannot judge the quality of fertilizers based on imported domestic ones Bad, some foreign ones are better but the price is more expensive, domestically produced prices will be relatively cheaper, you need to comprehensively cost-effective, choose the right one.
Misunderstanding 2: The fast dissolving is a good fertilizer. Compound fertilizer is made of nitrogen fertilizer, phosphate fertilizer, potash fertilizer and mineral powder through granulation. Nitrogen fertilizer and potash fertilizer are easily soluble in water, while phosphate fertilizer and mineral powder are insoluble or slow to dissolve. If the phosphorus content in the compound fertilizer is high, it will dissolve slowly; if the content of nitrate nitrogen, ammonium chloride or ammonium sulfate is high, it will dissolve quickly; the quality of mineral powder is good and the dosage is small, and it dissolves quickly, but the fertilizer strength is low and the powder is more. . It can be seen that the speed of fertilizer dissolution is the requirement of the formula ingredients in the production, and does not indicate the pros and cons of the product and its authenticity.
Misunderstanding 3: Direct seed dressing with superphosphate Superphosphate contains 3.5% to 5% of free acid, which is very corrosive. Direct seed dressing will reduce the germination rate and emergence rate of seeds. The correct application method is to make top dressing and deep application. When making seed fertilizer, it should be applied 5-6 cm below or beside the seed, and the fertilizer should be separated from the seed with soil.
Misunderstanding 4: Shallow application of nitrogen fertilizer or urea application is amide nitrogen fertilizer, which contains high nitrogen. After being applied to the soil, a small amount of it is directly absorbed and used by plants, most of which must be decomposed by microorganisms and converted into ammonium nitrogen before it can be absorbed by crops use. The nature of ammonium bicarbonate is unstable. If the utilization rate of shallow application on the surface is low, at the same time, the amount of shallow topdressing of nitrogen fertilizer is large and the concentration is too high, the volatile ammonia gas will injure the crop stems and leaves, causing fertilizer damage.
Misunderstanding 5: Use cold water to dissolve borax. Use cold water to dissolve borax. Borax will quickly "recrystallize" and lose its fertilizer effect. Generally, borax is placed in a thermos before application, dissolved with boiling water, and the cork is tightly closed and brought to the field, and then cold water is added to the required concentration, which can greatly improve the effect.
Misunderstanding 6: Calcium-magnesium phosphate fertilizer as top dressing. Calcium-magnesium phosphate fertilizer is not easy to dissolve in water, and the fertilizer effect is slow. It is not suitable for top dressing, especially after the middle stage of crop growth. Its utilization rate is low and the effect is poor. The correct application method is to use calcium-magnesium-phosphate fertilizer only as a base fertilizer and organic fertilizer, or as a seed dressing fertilizer.
Misunderstanding 7: Mixed use of zinc fertilizer and phosphate fertilizer Because there is a serious "antagonistic effect" between zinc and phosphorus, if zinc sulfate and superphosphate are mixed, the fertilizer efficiency of zinc sulfate will be reduced. Zinc fertilizer and phosphate fertilizer should be applied separately, as basal fertilizer and seedling fertilizer respectively, so as to improve the fertilizer efficiency of phosphorus and zinc fertilizer.
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