Urea-based potassium humate compound fertilizer for drip irrigation and preparation method of urea-based potassium humate compound fertilizer

Abstract

The invention discloses a urea-based potassium humate compound fertilizer for drip irrigation, which is prepared from urea, potassium nitrate, potassium sulfate, monopotassium phosphate, calcium chloride, magnesium sulfate, borax, trace elements, citric acid, polyglutamic acid, potassium humate and water. Due to the fact that humic acid and urea substances have very high complexing adsorption capacity on metal ions, and a coating containing polyglutamic acid is attached to the surface of the compound fertilizer, adhesion and caking among crystals in the storage and transportation process can be reduced; and due to the fact that citric acid has a good chelating effect on calcium and magnesium ions, the calcium and magnesium ions can be adsorbed in the dissolving process, so that potassium humate and medium trace elements are prevented from being combined with other ions to generate precipitation and cause failure. In addition, the compound fertilizer with the coating attached to the surface still has good water solubility and can meet drip irrigation use, and polyglutamic acid forms a thin film on the surface layer of plant root hair, so that the polyglutamic acid is easy to absorb, and the utilization rate of the fertilizer is improved. The invention also provides a preparation method of the compound fertilizer.

Description

technical field [0001] The invention relates to the technical field of organic fertilizers, in particular to a urea-based potassium humate compound fertilizer for drip irrigation and a preparation method thereof. Background technique [0002] Humic acid is an important part of organic matter. It can not only improve the physical and chemical properties of soil, stimulate crop growth, but also enhance the stress resistance of crops and improve the quality of agricultural products. Because of this, humic acid has been widely concerned in agricultural production, and various humic acid fertilizers have appeared in the market. Humic acid substances have a strong complexation and adsorption capacity for metal ions, which can reach hundreds of milligrams of metal ions per gram of humic acid products. The binding sites for complexation and adsorption reactions between humic acid substances and metal ions are mainly carboxyl groups and Phenolic hydroxyl. However, when humic acid i...

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Problems solved by technology

However, when humic acid is used directly, it is easy to combine with other ions and precipitate when it is dissolved, resulting in failure

[0003] Drip irrigation fertilizers are generally powdery water-soluble fertilizers. However, due to the large specific surface area of ​​powdery fertilizers, their crystals are easily agglomerated during storage and transportation, making it difficult to prevent fertilizers from compacting.

Moreover, the trace elements in the fertilizer are easily solidified by phosphate radicals, so it is necessary to use expensive complex trace elements. Although the complex trace elements are water-soluble, they are difficult to be absorbed and utilized during crop metabolism, and their effectiveness is greatly improved. decline

In addition, although the granular water-soluble fertilizer of the prior art solves the problem of product caking, the anti-caking agents used are all oil-soluble anti-caking agents. When drip irrigation is used, oily substances will adhere to the dropper and dripper. Caused damage to drip irrigation facilities

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