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How to mix fertilizer?
Vegetable crops need a variety of nutrients for growth and development. Usually, most of the chemical fertilizers we produce and buy contain only one element or two elements. For example, urea, ammonia, ammonium bicarbonate, etc. are very simple nitrogen fertilizers, and potassium chloride is also very simple. Potash fertilizer, only a few compound fertilizers contain multiple nutrients. Therefore, we often use a single fertilizer to use a fertilizer blender to mix two or more fertilizers and then apply it, which can reduce the number of fertilizer applications.
Step method of mixed fertilizer:
1.Mixing of different chemical fertilizers: the conditions that can be mixed: ammonium sulfate and superphosphate, ammonium sulfate and phosphate rock powder, urea and phosphate fertilizer, ammonium nitrate, and potassium chloride. After they are mixed, they form a compound fertilizer of nitrogen, phosphorus and nitrogen, and potassium, which not only has no loss of nutrients but also reduces the adverse effects of various fertilizers when applied separately and improves the fertilizer efficiency. The physical properties of it are easy to apply. The mixed application of ammonium sulfate and phosphate rock powder can increase the solubility of the phosphate rock powder and improve the fertilizer efficiency of the phosphate rock powder.
2.Conditions that can be mixed temporarily but not for a long time: some fertilizers should be applied immediately after mixing, and will not cause adverse effects on vegetable crops, but if they are mixed for a long time, it will cause the effective nutrient content to decrease and the physical properties to deteriorate. For example, the mixture of superphosphate and nitrate nitrogen fertilizer (ammonium nitrate, etc.) is more prone to deliquescence, and can also cause the gradual decomposition of nitrate nitrogen, resulting in nitrogen loss. After urea is mixed with potassium chloride, lime nitrogen, and potassium chloride and placed for a long time, it will increase the hygroscopicity and deteriorate the physical properties of the fertilizer.
3.Non-mixing conditions: After mixing this type of fertilizer, it will cause nutrient loss and reduce fertilizer efficiency. For example, ammonium nitrogen fertilizers (ammonium nitrate, ammonium sulfate, etc.) mixed with alkaline fertilizers (such as lime, steel slag phosphate fertilizer, lime nitrogen or plant ash, etc.) will cause nitrogen loss. For example, if quick-acting phosphorus fertilizers such as superphosphate are mixed with alkaline fertilizers such as lime nitrogen, lime, steel slag phosphate fertilizer, plant ash, etc., it will cause phosphoric acid degradation and reduce the effective phosphorus content. The mixing of poorly soluble phosphate fertilizers with alkaline fertilizers makes it more difficult for crops to absorb and utilize the phosphorus in poorly soluble phosphate fertilizers.
4.Mixing of organic fertilizers and chemical fertilizers: when it is possible to mix: such as the mixing of stable manure, compost and calcium-magnesium phosphate fertilizer, the organic acids produced by the fermentation of stables and compost can promote the decomposition of insoluble phosphorus. Stables, compost, and superphosphate can be mixed to reduce the contact of available phosphorus in phosphate fertilizers with the soil and prevent phosphorus from being fixed by the soil. When organic fertilizers with strong acidities, such as high-level peat, are mixed with alkaline fertilizers (such as lime, steel slag phosphate fertilizer, lime nitrogen or plant ash, etc.), the alkalinity in the alkaline fertilizer can neutralize the acidity of the peat. Human feces mixed with a small amount of superphosphate can form diammonium phosphate, reducing and preventing the loss of ammonia volatilization.
5. Conditions not suitable for mixing: Some unripe manure and compost cannot be mixed with nitrate fertilizer, otherwise it is easy to produce denitrification and cause nitrogen loss. Fresh organic matter containing a lot of fibrous substances should not be mixed with mineral fertilizers. It should be mixed with mineral fertilizers after it is decomposed. However, there are exceptions, that is, do not mix with alkaline fertilizers even if it is decomposed human feces. So as not to accelerate the volatilization of ammonia.