The combination of ammonium bicarbonate and superphosphate can enable crops to absorb nutrients such as nitrogen and phosphorus while neutralizing a part of the free acid in superphosphate to eliminate its hazards. However, it should be noted that the mixing ratio of the two should be appropriate, the pH value should remain slightly acidic to neutral, and it should not be alkaline. Otherwise, the water-soluble phosphorus in the superphosphate can easily be converted into insoluble phosphorus in the alkaline environment, thus reducing the fertilizer efficiency. . Some of the products obtained by mixing ammonium nitrate and potassium chloride are ammonium chloride and potassium nitrate. They have better physical properties than ammonium nitrate, have less deliquescence, and are easy to apply. However, it should not be put for a long time after mixing. Phosphorite or calcium magnesium phosphate fertilizer and composting system. Promote the effect of phosphate fertilizer. Organic acids produced by the decomposition of organic matter in the compost can turn insoluble phosphate fertilizer into a readily soluble state. Calcium superphosphate and ammonium nitrate are mixed with each other, or the free acid in calcium superphosphate is first neutralized with 10% to 20% of rock phosphate or 5% of ash, and then mixed and applied. Urea is mixed with potassium chloride or superphosphate, and a small amount of dry manure or dry peat (50 kg per 500 kg of fertilizer) can be added and used with the mix. Ammonium nitrogen fertilizer or manure can not be mixed with alkaline fertilizers (such as grass ash, calcium magnesium phosphate fertilizer, etc.), otherwise it is easy to cause loss of nitrogen volatilization. Superphosphate cannot be mixed with alkaline substances. Otherwise it will make soluble phosphoric acid into weakly soluble or insoluble phosphoric acid, reducing the effectiveness of phosphorus. Nitrate nitrogen fertilizer should not be mixed with organic fertilizers, especially unripe organic fertilizers, because the five carbon sugars in organic fertilizers are the most suitable nutrients for nitrate-reducing bacteria, which will promote the reduction of nitric acid, resulting in the loss of nitrogen volatilization.
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