How to verify the variety of slow-release fertilizers?

The regular qualified slow-release fertilizer packaging should clearly indicate the type and nutrient content of the controlled-release nutrients of the fertilizer. The positive or negative side of the package 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 were 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 and the data is too large, the quality is doubtful.

Particle inspection

At present, many manufacturers make the fertilizer granules colorful, but don't think that the particles with different colors are controlled release fertilizer. Many fake fertilizer processing plants are designed to cater to the shallow and obvious understanding of growers. By adding chemical pigments, the particles are dyed into different colors and presumably sold as controlled release fertilizers. Buy fertilizers to look for regular manufacturers, don't be deceived. In general, the wrapped type of controlled release fertilizer granules will have a peelable intact film on the outside. If it is difficult to peel off, it can be peeled off by a knife or the like. If the sustained release nutrient granules in the package are damaged or enveloped. Most of them are incomplete and can be regarded as inferior slow release fertilizer.

Test dissolution

Unlike fast-dissolving fertilizers, slow-release granules do not melt immediately when placed in water. Some coated slow-release fertilizer granules will absorb water and swell, and the addition of hot water will release faster, but it is much slower than ordinary fertilizer. After the water is cooled to normal temperature, the fertilizer is pinched with fingers. If the softness is the majority, it is the controlled release fertilizer. If the fertilizer is not soft or pinched, it is not controlled release fertilizer.

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