The most important problem encountered with mixed fertilizers in mixed application is the defects from their physical properties, resulting in inconveniences in storage, transportation and field application. For example, agglomeration, dust, secondary separation of particles and water absorption are too large. Therefore, growers need to understand the physical properties of common nitrogen, phosphorus and potassium fertilizers, especially hygroscopicity, agglomeration and particle size, and pressure resistance.

Hybrid principle: the hygroscopicity and agglomeration after mixing are as small as possible

Hygroscopicity refers to the ability of chemical fertilizers to absorb moisture in the air; agglomeration is related to the hygroscopicity of the surface of elemental fertilizer particles, and fertilizers with high hygroscopicity are prone to agglomeration. These two properties are very unfavorable for the storage, transportation and application of fertilizers. The principle of fertilizer application requires that the hygroscopicity and agglomeration of the mixture be as small as possible.

However, most water-soluble fertilizers absorb the moisture of the air more or less, but the differences between the different varieties are very large. A low moisture absorption point at normal temperature indicates that the hygroscopicity is large and the fertilizer is deliquescent. Among common fertilizers, calcium nitrate and ammonium nitrate have the lowest moisture absorption point; ammonium chloride, urea and potassium chloride are medium; ammonium sulfate, superphosphate and potassium sulfate have higher moisture absorption points.

Mixed method: choose performance-compatible fertilizer application

Some chemical reactions are often produced during the mixing of two or more elemental fertilizers. Some of these reactions are benign, and some may result in increased hygroscopicity and agglomeration or effective nutrient fixation to reduce fertilizer efficiency. Therefore, it is necessary to select a chemically compatible elemental fertilizer for mixed application.

In the common elemental nitrogen fertilizer and phosphate fertilizer, the material of the superphosphate mixed with ammonium sulfate is good and can be directly used as seed fertilizer or base fertilizer; and the superphosphate and ammonium hydrogencarbonate are limited.

The two must be mixed in a certain proportion, and should be used as a base fertilizer with the mixture, do not store, the optimal ratio of the two is superphosphate: ammonium bicarbonate is about 7:3, too much ammonium bicarbonate can easily reduce the water solubility in the superphosphate The proportion of sex phosphorus. More phosphate fertilizer can be applied to the soil as a base fertilizer at one time, while less ammonium carbonate can be reserved for later fertilizer application.

Mixing requirements: the mixed fertilizer size should match

Several granular fertilizers are mixed, and during storage, transportation and application, delamination may occur, resulting in uneven fertilization and poor fertilizer efficiency. The delamination problem is related to the uneven size of different fertilizer granules. Therefore, the particle size of the fertilizer to be mixed should be controlled, and only the fertilizer with the matching particle size can be used to achieve uniform fertilization, and the fertilizer effect can be guaranteed.

This article URL: What are the precautions for the use of elemental fertilizers? How to mix different types of fertilizers?

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