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Wrapped urea sustained-release fertilizer and preparation method thereof

A wrap-type, urea technology, applied in the field of comprehensive utilization of resources, can solve the problems that environmental protection and improvement effects are not as good as organic fertilizers, chemical substances destroy the natural structure of the soil, and the cost of slow-release fertilizers increases, so as to realize the reallocation of resources and reduce fertilization. The effect of saving farmers' economic input

Inactive Publication Date: 2012-04-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, there are problems with packaged slow-release fertilizers: (1) There are more chemical fertilizers added, which not only increases the cost of slow-release fertilizers, but also under the same conditions, the fertilizer efficiency and environmental protection and improvement effects on soil are not as good as organic fertilizers; (2) ) The addition of more chemical substances in the slow-release fertilizer coating layer will destroy the natural structure of the soil to a certain extent, and easily cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take by weighing 200g of commercially available bentonite with a water content of 10%, add 160ml of water and mix uniformly, the water content of this bentonite is 50%; according to the mass ratio of 20:1, mix 200g of biogas residue with a water content of 85% and 10g plant ash; The prepared bentonite and biogas residue ash mixture are evenly mixed to be the coating raw material; according to the mass ratio of urea, biogas residue plant ash mixture, and bentonite 20:21:20, weigh 220.5g of the more common particle diameters in the market. 2 ~ 4mm ordinary urea, fully mix it with the prepared coating raw material mixture, so that the mixture evenly adheres to the surface of urea particles, wrap the finished product and place it in an open and dry place. After the water is naturally air-dried, sift to remove impurities , that is, the coated urea slow-release fertilizer is packaged and properly stored.

Embodiment 2

[0022] Take by weighing 210g of commercially available bentonite with a water content of 10%, add water 168ml, and this bentonite has a water content of 50%; according to the mass ratio of 20:1.5, mix 200g of biogas residue with a water content of 80% and 15g of plant ash; The prepared bentonite and biogas residue ash mixture are evenly mixed to be the coating raw material; according to the mass ratio of urea, biogas residue plant ash mixture, and bentonite 23:21.5:21, weigh 230g of the more common particle diameter on the market with a diameter of 2 ~4mm ordinary urea, fully mix it with the prepared coated raw material mixture, make the mixture evenly adhere to the surface of urea particles, place the package in an open and dry place, and after the water is naturally air-dried, sieve to remove impurities, that is, Coated urea slow release fertilizer, packaged for safe storage.

Embodiment 3

[0023] Embodiment 3: Slow-release experiment of coated urea slow-release fertilizer

[0024] Indoor slow-release experiment: under normal temperature conditions without heating and pressurization, it only takes 9 minutes for the original ordinary urea to be fully released and dissolved, and it takes 52 hours for all the nutrients in the coated urea slow-release fertilizer of the present invention to be dissolved.

[0025] Field slow-release experiment: the nutrient release rate is related to soil moisture, temperature and planted crops. The soil in the test field is under natural moisture conditions. The nutrient release duration of the coated urea slow-release fertilizer of the present invention is 120 days to 140 days, which is longer than that of ordinary urea The nutrient release time was more than doubled. Compared with the application of the original common urea, one-time fertilization of wheat and corn can increase the yield by 10% to 20%, and the fertilizer utilization...

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Abstract

The invention discloses a wrapped urea sustained-release fertilizer and a preparation method thereof. According to the invention, rural organic solid waste rich in organic matters is adopted as a raw material; plant ash and an anaerobic fermentation product biogas residue are bonded with the bonding property of bentonite; the mixture is well mixed according to a certain ratio, and is used for wrapping urea, such that the wrapped sustained-release fertilizer is obtained. The fertilizer provided by the invention is advantaged in simple production method, and low cost. The materials are easy to obtain. The sustained-release fertilizer is especially suitable for rural family daily fertilization. With the fertilizer and the preparation method, the utilization efficiency of the fertilizer is improved; the fertilizer dosage and the economic investment of farmers are reduced; no side effect is brought to animals and growing environments thereof; and no soil agglutination is caused.

Description

technical field [0001] The invention relates to a packaged urea slow-release organic fertilizer and a preparation method thereof, belonging to the technical field of comprehensive utilization of resources. Background technique [0002] Plant (herbaceous and woody plants) residues after burning, called plant ash. Plant ash fertilizer Because plant ash is the ashes of plants after burning, plant ash contains almost all the mineral elements contained in plants. The main component of plant ash is potassium carbonate (K 2 CO 3 ), generally containing 6-12% potassium, of which more than 90% are water-soluble and exist in the form of carbonate; followed by phosphorus, generally containing 1.5-3%; also containing calcium, magnesium, silicon, sulfur and iron, manganese, Copper, zinc, boron, molybdenum and other micronutrients. The ash content of different plants has different nutrient content, and the potassium content of sunflower straw is the highest. When plant ash is applied...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G5/00
CPCY02A40/20Y02W30/40
Inventor 宁平瞿广飞贾丽娟熊向峰冯辉
Owner KUNMING UNIV OF SCI & TECH
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