The water-soluble monocalcium phosphate in superphosphate is easily fixed in the soil and has low mobility. Therefore, the principle of rational application of superphosphate is to reduce the contact area with soil, and increase its contact with the root system as much as possible. opportunity. 1. Concentrated application and application of concentrated application (application of acupuncture and acupoints) can reduce the contact surface between fertilizer and soil, reduce fixation, and increase the chance of contact with the root group, so that the root system can easily absorb phosphorus nutrition. On the basis of centralized application, it is better to adopt a stratified application, that is, most of the phosphate fertilizers are used as deep-seated basal fertilizers, and some are shallowly applied or used as seed fertilizers. When making fertilizers or root fertilizers, it is necessary to pay attention to the damage of free acids in superphosphate to the seeds and roots. Generally, 2%-3% of the ash equivalent to the amount of phosphate fertilizer can be mixed and stacked for half a day before being mixed with the seed for the root fertilizer. Phosphate fertilizer should be mixed with 1-2 times the maturity of organic fertilizer or fine soil mixed stacking half a day to 1 day after the water transferred into a paste 蘸秧 root. 2. The decomposition product of organic fertilizer combined with organic fertilizer can reduce the fixation of phosphorus, such as iron and aluminum in soil. 3, made of granular fertilizer made of superphosphate particles, reduce contact with the soil. Granular fertilizer is suitable for mechanical application and it is safe to make fertilizer. 4. Acid soils should be applied lime and lime ploughs should be applied first before applying phosphate fertilizers. Do not mix lime with superphosphate to avoid reducing the effectiveness of phosphorus. 5. Apply calcium superphosphate 10 times water to soak overnight before top-dressing fertilizer, and take the clear liquid to dilute to the required concentration and then spray. Spraying different concentrations of various types of crops, rice, wheat and other cereals can be used 1% -3% leachate, fruit trees available about 2% concentration, cotton, vegetables available 1% concentration.
Excerpted from China Agricultural Press>
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