See nutrient release period
In the packaging of officially qualified slow- and controlled-release fertilizers, the type and nutrient content of the controlled release nutrients of the fertilizer should be indicated. The positive or negative aspects of the packaging should indicate the initial nutrient release rate and cumulative nutrient release rate of the product. The initial nutrient release rates of slow-release fertilizers and controlled-release fertilizers should be 15% and 12%, respectively, and the cumulative nutrient release rates were 80% and 75%, respectively. If the index of the controlled-release fertilizer is too large, the quality of the controlled-release fertilizer is doubtful.
Test particle
At present, many manufacturers make colorful fertilizer particles, but do not think that particles of different colors are controlled-release fertilizers. A lot of fake fertilizer processing plants are just to cater for the shallow appearance of growers. By adding chemical pigments, the particles are dyed in different colors and sold under controlled release fertilizer. Buy fertilizer to look for regular manufacturers, do not be deceived. In general, the packaged slow-release fertilizer particles have a peelable and intact film on the outside. If it is hard to peel off, it can be peeled off with a knife, etc. If the sustained-release nutrient particles in the packaging bag are seriously damaged or coated Most are incomplete and can be considered inferior slow-release fertilizers.
Dissolve
Unlike instant fertilizers, slow-release pellets do not melt immediately when placed in water. Some coated slow-release fertilizer particles will swell with water, and will be released faster when added with hot water, but much slower than ordinary fertilizers. After the water is cooled to room temperature, the fertilizer is kneaded with a finger, and if it is soft, it is a controlled-release fertilizer. If the fertilizer is broken when it is not soft or kneaded, it is not controlled-release fertilizer.
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