First, the use of controlled release fertilizers
The first is the choice of fertilizer types. At present, there are many types of controlled release fertilizers according to different controlled release periods and nutrient contents. The different controlled release periods mainly correspond to the length of crop growth period. Different nutrient contents mainly correspond to the fertilizer requirements of different crops, so it must be in the process of fertilization. The application is selected in a targeted manner.
The second is the period of application. Slow-release fertilizer must be used as a base fertilizer or a previous top dressing, that is, when the crop is planted or during the seedling growth period after sowing.
The third is the amount applied. It is recommended that the amount of controlled release fertilizer per unit area of ​​crops should be applied according to 80% of the fertilization amount in previous years. It should be noted that farmers' friends should increase or decrease according to different target yields and soil conditions.
The fourth is the method of application. The application of controlled release fertilizer should be done to isolate the fertilizer, and the ditch (strip) should be applied to the soil. For example, corn and cotton generally require the separation distance between seeds and fertilizer to be 7-10 cm, and the depth of application into the soil is about 10 cm.
Second, the quality of controlled release fertilizer
1. Put the controlled release fertilizer and common compound fertilizer in two glass cups filled with water, gently stir for a few minutes, the compound fertilizer will dissolve faster, the particles become smaller or completely dissolved, and the water is turbid, and the control The release fertilizer does not dissolve, and the water quality is clear, no impurities, and bubbles appear around the particles.
2. Because the core of controlled release fertilizer is NPK compound fertilizer, the controlled release fertilizer stripped in the outer shell will be dissolved quickly in the water. If the shell is not dissolved, it is inferior fertilizer or fake fertilizer.
3. Can not be distinguished by color. Some manufacturers counterfeit the color of controlled release fertilizer, and make the common fertilizer the same color as the controlled release fertilizer. If it is placed in the water, the controlled release fertilizer is decolorized, the water is turbid and colored, indicating that it is a counterfeit product, and the true controlled release fertilizer outer membrane. It is not bleached. (from Ping)
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