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Slow release fertilizer and preparation method

A slow-release fertilizer and urea technology, applied in the field of fertilizer science, can solve problems such as time-consuming and labor-intensive, nutrient pollution of river water, and no slow-release function

Inactive Publication Date: 2005-11-16
诸城市良丰化学有限公司
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  • Summary
  • Abstract
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Problems solved by technology

The above-mentioned fertilizer has a single nutrient component and has no slow-release function. After application, it decomposes quickly, and only a small amount is absorbed by crops. The fertilizer utilization rate is only between 25% and 35%, and the rest of the nutrients are volatilized or washed away by rainwater. Nutritional pollution seriously endangers the environment and people's health
Because the above-mentioned fertilizers are harmful to seeds and their young shoots, farmers have to apply them multiple times during the fertilization process. First, apply base fertilizer in the soil before sowing the crops and then sow them. Time-consuming and labor-intensive, and limited by rain

Method used

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Embodiment Construction

[0006] A slow-release fertilizer and a preparation method thereof. The slow-release fertilizer is composed of a composition of urea, potassium sulfate, formaldehyde, sodium hydroxide, a reaction catalyst and magnesium oxide.

[0007] The preparation method is as follows: (1) Add 600kg of water or mother liquor into the stirred reactor, heat up to 40-60°C, then add 500±1kg of solid urea, 380±1kg of potassium sulfate, 250±0.5kg of formaldehyde, sodium hydroxide 100±0.5kg, reaction catalyst 5±0.51kg, stir until all solids are dissolved.

[0008] (2) Add concentrated phosphoric acid to the mixing tank to control the pH value until a large amount of white precipitate appears, then stir and cool to 30-40°C.

[0009] (3) Filtrate after stirring and cooling for 3 hours, the filtrate is returned to the reaction kettle, and the solid is an intermediate product, and the nutritional content is analyzed by sampling.

[0010] (4) Calculate and add magnesium oxide according to the nutrient ...

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Abstract

A slowly-releasing fertilizer is prepared from urea, potassium sulfate, form-aldehyde, sodium hydroxide, magnesium oxide and catalyst through chemical synthesis. Its advantages are rich nutrients and durable fertility.

Description

Technical field: [0001] The invention relates to the technical field of fertilizer science related to plant nutrition, in particular to a slow-release fertilizer and a preparation method thereof. Background technique: [0002] my country's current crops such as wheat, corn, rice, rapeseed, and flowers mostly use a single nitrogen fertilizer or a compound fertilizer or compound fertilizer containing only nitrogen, phosphorus, and potassium. The above-mentioned fertilizer has a single nutrient component and has no slow-release function. After application, it decomposes quickly, and only a small amount is absorbed by crops. The fertilizer utilization rate is only between 25% and 35%, and the rest of the nutrients are volatilized or washed away by rainwater. Nutritional pollution seriously endangers the environment and people's health. Because the above-mentioned fertilizers are harmful to seeds and their young shoots, farmers have to apply them multiple times during the fertil...

Claims

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Application Information

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IPC IPC(8): C05G1/00
Inventor 宋良梁允生
Owner 诸城市良丰化学有限公司
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