Sustained and controlled release composite fertilizer and preparation method thereof

A compound fertilizer and fertilizer technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of shortening the release time of chemical fertilizers, affecting the growth of crops, and high production costs, achieving good drought resistance and water retention, long nutrient release time, and chemical fertilizers. High utilization effect

Active Publication Date: 2014-05-07
CNSG ANHUI HONG SIFANG FERTILIZER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Urease inhibitors, esterification inhibitors, and nitrification inhibitors are chemical raw materials. While reducing nutrient loss in the soil and increasing the nutrient absorption rate, they are prone to chemical reactions with other substances in the soil. Long-term application can easily cause soil compaction. Affect the growth of crops; the coating materials used in resin-coated fertilizers are often polymer materials, and the production cost is relatively high. Because they are not easy to decompose, they will cause secondary pollution when buried in the soil, which is not conducive to environmental protection. Because coated chemical fertilizers rely entirely on the coating to achieve the slow release of nutrients, when the coating is damaged, the release time of the fertilizer's nutrients will be greatly shortened, which is not reliable

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  • Sustained and controlled release composite fertilizer and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] A slow-release compound fertilizer, characterized in that it is composed of the following raw materials by weight: 30% nitrogen fertilizer, 16.2% phosphate fertilizer, 14.2% potassium fertilizer, 3.5% fertilizer nutrient fixative, and citric acid-soluble phosphorus containing 20% ​​phosphorus pentoxide. Ore powder 18%, citric acid-soluble potassium feldspar powder containing 10% potassium oxide 18%, phosphate-solubilizing potassium-solubilizing bacteria 0.1%.

[0030] The proportion of each component in the fertilizer nutrient fixative is: sepiolite 85.5%, polyaluminum ferric chloride 12.9%, chitosan 1.6%

[0031] A preparation method of slow and controlled release compound fertilizer, comprising the following steps:

[0032] 1) To make fertilizer nutrient fixative: fully mix sepiolite, polyaluminum ferric chloride and chitosan according to the proportion, and pulverize to 80 mesh;

[0033] 2) Transport NPK fertilizer, fertilizer nutrient fixative, citric acid soluble ...

Embodiment 2

[0037] A slow-release compound fertilizer, characterized in that it is composed of the following raw materials by weight: 32% nitrogen fertilizer, 16% phosphate fertilizer, 14% potassium fertilizer, 3% fertilizer nutrient fixative, and citric acid-soluble phosphorus containing 25% phosphorus pentoxide. Ore powder 13.6%, citric acid-soluble potassium feldspar powder containing 15% potassium oxide 21.3%, phosphate-solubilizing potassium-solubilizing bacteria 0.1%.

[0038] The proportion of each component in the fertilizer nutrient fixative is: sepiolite 97.7%, polyaluminum ferric chloride 1.9%, chitosan 0.4%

[0039] A preparation method of slow and controlled release compound fertilizer, comprising the following steps:

[0040] 1) To make fertilizer nutrient fixative: fully mix sepiolite, polyaluminum ferric chloride and chitosan according to the proportion, and pulverize to 160 mesh;

[0041] 2) Transport NPK fertilizer, fertilizer nutrient fixative, citric acid soluble phos...

Embodiment 3

[0045] A slow-release compound fertilizer, characterized in that it is composed of the following raw materials by weight: 31% of nitrogen fertilizer, 16.5% of phosphate fertilizer, 14.5% of potassium fertilizer, 3.88% of fertilizer nutrient fixative, and citric acid-soluble phosphorus containing 22% of phosphorus pentoxide. Ore powder 14.05%, citric acid-soluble potassium feldspar powder containing 14% potassium oxide 20%, phosphate-solubilizing potassium-solubilizing bacteria 0.15%.

[0046] The proportion of each component in the fertilizer nutrient fixative is: sepiolite 89%, polyaluminum ferric chloride 9.1%, chitosan 1.9%

[0047] A preparation method of slow and controlled release compound fertilizer, comprising the following steps:

[0048] A preparation method of slow and controlled release compound fertilizer, comprising the following steps:

[0049] 1) To make fertilizer nutrient fixative: fully mix sepiolite, polyaluminum ferric chloride and chitosan according to the...

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Abstract

The present invention discloses a sustained and controlled release composite fertilizer and a preparation method thereof. The sustained and controlled release composite fertilizer comprises a nitrogen fertilizer raw material, a phosphorus fertilizer raw material, a potassium fertilizer raw material, a fertilizer nutrient fixing agent, citrate soluble phosphate ore powder, citrate soluble potassium feldspar powder, and phosphorus and potassium bacteria. According to the present invention, the fertilizer nutrient fixing agent is adopted to replace the sustained and controlled release fertilizer, such that nutrients and moistures around crop root systems can be firmly locked with the fertilizer nutrient fixing agent so as to avoid nutrient and moisture loss; the citrate soluble phosphate ore powder and the citrate soluble potassium feldspar powder are added, and the phosphorus and potassium bacteria is adopted to activate, such that sufficient nutrients are provided for later growth of crops, a nutrient release time is long, an effect of one-time applying without top dressing is really achieved, and the whole production process has characteristics of simpleness, low cost, economy and environmental protection.

Description

technical field [0001] The invention relates to a slow and controlled release compound fertilizer, in particular to a preparation method of the slow and controlled release compound fertilizer. Background technique [0002] According to relevant statistics, the input of chemical fertilizers accounts for about 50% of the total input of farmers in planting production, and 50% of the increase in grain production in developing countries comes from the role of chemical fertilizers. However, at present, the utilization rate of nitrogen fertilizer in the current season in my country is only 20% to 35%, the utilization rate of phosphorus fertilizer is 10% to 20%, and the utilization rate of potassium fertilizer is 30% to 60%, which is far lower than the utilization level of developed countries in the world. The low utilization rate of fertilizers not only causes a huge waste of resources, but also causes serious pollution to the environment on which human beings depend. Therefore, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 沈继军高继成周斌吴争明魏丛新向周平
Owner CNSG ANHUI HONG SIFANG FERTILIZER IND CO LTD
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