Effect of solubility of chemical fertilizer on fertilizer utilization efficiency

As a farmer (a real farmer), no matter growing grain, vegetables or fruit trees, he will inevitably deal with fertilizer every year. For most farmers, it is not known whether the water solubility of fertilizers has an effect on fertilizer utilization. Under normal circumstances, farmers pay more attention to the price and less about the solubility of fertilizer when choosing fertilizer. Next, I would like to talk about the effect of fertilizer solubility (water solubility) on fertilizer efficiency, which can be used as a reference for your future selection and purchase of fertilizers.

The first is nitrogen. The water solubility of nitrate nitrogen is the best, and the utilization rate of nitrate nitrogen is the highest. Followed by amide nitrogen, ammonium nitrogen and so on.

The second is phosphorus. The water solubility of phosphorus is poor, especially the water solubility of calcium superphosphate and calcium magnesium phosphate fertilizer is poor, and its utilization rate is not as good as monoammonium phosphate, diammonium phosphate, nitrophosphate and other phosphorus-containing compound fertilizers. It is also true that the utilization rate of agricultural monoammonium phosphate is lower than that of industrial monoammonium phosphate.

The third is potassium. The water solubility of potassium is also poor, especially the domestic granular potassium sulfate, its water solubility is very poor, and the utilization rate is relatively low. However, potassium nitrate has high water solubility and high utilization rate.

Plants absorb nutrients mainly through their roots. How can the fertilizer we apply to the soil reach the roots of the plant? There are usually two processes. One is called the diffusion process. After the fertilizer was dissolved into the soil solution, the nutrients near the root surface were absorbed, the concentration decreased, and the concentration of the soil solution far away from the root surface was relatively high, resulting in diffusion, nutrients moved to the low concentration of the root surface, and finally absorbed. The other is through mass flow, that is, plants open leaf stomata under light, transpiration, resulting in water loss. Roots must continuously absorb water for leaf transpiration loss. When the water near the root is absorbed, the distant water flows to the root surface, and the nutrients dissolved in the water reach the root surface, which is absorbed by the root system. Therefore, fertilizers must be dissolved in order to be absorbed, insoluble fertilizer plant roots can not be absorbed, is ineffective. Therefore, the higher the water solubility, the higher the probability of root absorption of fertilizer plants, which is the reason for the high utilization rate of water-soluble fertilizer.

The above is my personal point of view, welcome to discuss together!

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