Phosphate fertilizer is made from fish bones, bones, eggshells, freshwater fish scales, cut hair, nails and so on. Phosphate fertilizer can be divided into water-soluble phosphate fertilizer, citric acid-soluble phosphate fertilizer and insoluble phosphate fertilizer according to its solubility. Phosphate fertilizers are classified into wet and hot methods according to production methods.
Problems in Phosphate Fertilizer Absorption:
1．The most direct symptoms of phosphorus deficiency are crop vary in size in the field, especially in orchards. Most fields will also behave like this now. Leaf surface at the top of a plant is small and purple.
2．Zinc fertilizer and phosphorus fertilizer can not be mixed. If zinc fertilizer and phosphorus fertilizer are mixed together, zinc phosphate, which is not easy to dissolve in water, will be formed. Zinc phosphate crop is very difficult to absorb and can not achieve the desired effect.
3．Excessive nutrients such as iron, zinc and nitrogen in soil can inhibit the absorption of phosphorus fertilizer.
4．When the PH value is 5.5, the absorptivity is only about 15% of PH value 6.5.
5．The absorptivity at 13 degrees is only 31% at 21 degrees.
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