Shenyang compound fertilizer Quality identification method
1. Appearance: diammonium phosphate is an irregular particle without moisture. Its center is dark brown and its edge is slightly yellow. The superphosphate particles are light gray in color and have poor surface smoothness.
2. Water solubility: diammonium phosphate, nitrophosphate and double superphosphate are all soluble in water; Granular superphosphate is only partially soluble in water.
3. Burning: diammonium phosphate and nitrophosphate can quickly melt on the red burning charcoal or iron plate and release ammonia gas; The SSP also has no ammonia smell on the red burning charcoal or iron plate, and the particle shape has no change.
4. Quantitative analysis shall be carried out in the laboratory if necessary.
influence Compound fertilizer Factors of application effect
The first is soil quality. Acidic nitrogen phosphorus compound fertilizer, such as monoammonium phosphate or humic acid nitrogen phosphorus potassium compound fertilizer and nitrogen phosphorus compound fertilizer, is generally suitable for slightly alkaline soil with low organic matter content and lack of available nitrogen and phosphorus.
Second, crop varieties. Nitrogen phosphorus compound fertilizer should be used for field crops, and nitrogen phosphorus potassium ternary compound fertilizer should be used for wheat fields or high-yield fields; Powdered compound fertilizer is suitable for wheat, rice, millet and other closely planted crops, while phosphorus potassium compound fertilizer is suitable for leguminous crops.
The third is the application method. If it is used as base fertilizer, granular compound fertilizer must be selected, and the higher the hardness of particles, the better, in order to extend the fertilizer effect.
How long can compound fertilizer take effect after being buried in soil
Generally speaking, compound fertilizer can be effective after being buried in soil for about 10 days, and the effective period of fertilizer is about half a month to three months.
Of course, the validity period and fertilizer validity period of different brands and concentrations of compound fertilizers are different. For details, please read the relevant instructions or consult the seller directly.
In general, the compound fertilizer has a long effect and is suitable for use as base fertilizer. The compound fertilizer can be buried in a certain depth of soil before sowing to make crops grow better.
Precautions for use of compound fertilizer
1. The concentration of compound fertilizer varies greatly, and proper concentration should be selected.
2. The concentration of compound fertilizer is high, and direct contact between fertilizer and seeds should be avoided, otherwise, seedling emergence will be affected, and even seedling burning and root rotting will occur.
3. The decomposition rate of compound fertilizer is slow. For crops that use compound fertilizer as base fertilizer during sowing, nitrogen fertilizer should be supplemented in time during topdressing according to the fertilizer demand law of different crops to meet the nutritional needs of crops.
4. Due to different raw materials of compound fertilizers, attention should be paid to the use range of nutrient components, so as to play a good role in fertilizer efficiency and improve crop yield.
5. When applying compound fertilizer, avoid surface spraying as much as possible and cover the soil deeply.
6. Compound fertilizer should not be used for seedling stage fertilizer and mid late stage fertilizer to prevent excessive growth.
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