Three Principles of Mixed Fertilizer Application

Some large growers like to use their own mixed fertilizers, but often encounter unpredictable problems during mixing. The three principles of mixed application of simple fertilizers can help farmers overcome the technical barriers related to fertilizer application.

Principle 1: The smaller the hygroscopicity and caking after mixing, the better

Hygroscopicity and caking, hygroscopicity refers to the ability of chemical fertilizers to absorb moisture in the air. The agglomeration is related to the hygroscopicity of the surface of the single-element fertilizer particles, and the fertilizer having a large hygroscopicity is easy to agglomerate. These two properties are very unfavorable for the storage, transportation and application of chemical fertilizers. The principle of mixed application of fertilizers requires that the smaller the hygroscopicity and the caking property, the better.

Measured by the moisture absorption point at room temperature, the hygroscopicity of the low moisture absorption point is large, and the fertilizer is easily deliquescence. The hygroscopicity of the fertilizer after mixing is significantly greater than that of the simple substance, and it is more prone to deliquescence.

Principle II:

Select chemically compatible simple fertilizers for mixed application

Mixing between different fertilizers often produces some chemical reactions. Some of these reactions can lead to increased hygroscopicity and agglomeration or effective nutrient fixation to reduce the effect of fertilizer. Chemically compatible single fertilizers are selected for mixed application. If two non-mixable single fertilizers are blended together, it will generate heat, increase humidity, evolve gas or agglomerate. For example, a combination of calcium sulphate and calcium carbonate results in the loss of ammonia. 2 Ammonium nitrate and urea are two kinds of simple fertilizers that are completely incompatible. If they are mixed and stacked, their hygroscopicity will be greatly enhanced, resulting in a relatively dry In the environment, the mixed materials are also susceptible to moisture absorption, and even appear to be dissolved and cannot be used. 3 Urea and superphosphate are two types of fertilizers that are limited in nature and can be mixed and used without storage. In the compound fertilizer processing plant, the free acid in the superphosphate is neutralized with ammonium to form an aminated superphosphate, which can be mixed with urea.

Principle 3:

The proportion of mixed fertilizer should be well controlled

In the common simple nitrogen fertilizers and phosphate fertilizers, calcium superphosphate and ammonium sulfate have good physical properties and can be directly used as seed fertilizers or basal fertilizers; while superphosphate and ammonium bicarbonate are finitely compatible, and the two must be mixed in a certain proportion. , and with the mix as a base fertilizer, can not be stored. The optimal ratio of the two: superphosphate:ammonium bicarbonate is approximately equal to 7:3; if too much ammonium bicarbonate can easily reduce the proportion of water-soluble phosphorus in the superphosphate. Phosphate fertilizer can be used as a base fertilizer once into the soil, and less ammonium bicarbonate can just leave part of the dressing for later use. In addition, the particle size of the fertilizer to be blended should be controlled. Only the fertilizer with a matching particle size can achieve uniform fertilization and the fertilizer effect can be guaranteed.

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