Coated nitrogen fertilizer with regular release and preparation method thereof

A technology of coated nitrogen fertilizer and coated materials, which is applied in the direction of fertilization equipment, fertilizer mixture, application, etc., can solve the problems of affecting the normal growth of plants, difficulty in fertilization, and reducing agricultural production efficiency, so as to improve the utilization rate of the season and benefit Growth and development, the effect of improving fertilizer use efficiency

Inactive Publication Date: 2016-10-05
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are some chemical fertilizers that are easy to volatilize after decomposing at room temperature, such as ammonium bicarbonate (NH 4 HCO 3 )
Therefore, during the application of chemical fertilizers, most of them are not absorbed by crops, but are lost with rainwater or volatilized with the air, resulting in a huge loss of nutrients.
[0005] Second, it is easy to agglomerate, which brings great difficulties to fertilization
In addition, after the fertilizer is made, due to external factors such as being squeezed and damp during transportation and sales, it will also cause the fertilizer to agglomerate.
The agglomerated chemical fertilizer will greatly increase the difficulty of transportation and use, and increase the cost, especially for mechanized fertilization.
[0006] Third, serious waste of resources
When farmers topdress, they often overdress the fertilizer in order to ensure suffi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the preparation of coated nitrogen fertilizer sample A

[0024] Crush and grind 40g of potassium sulfate or sodium sulfate (chemically pure), pass through a 200-mesh sieve, and use it as a solid coating material for later use. Take 1 kg of ordinary large granular urea (containing N46%) as the coated core and put it into the fluidized bed. Start the coating machine, adjust the fan temperature so that the inlet air temperature is lower than the urea melting temperature (120-125°C), and the feed material temperature is controlled at 60-65°C; set the pipeline insulation steam pressure to 0.20-0.30MPa, fluidize Bed inlet air pressure 0.2-0.6Mpa. The inlet wind speed should be smaller than the exhaust wind speed. Start the equipment, set the rotating speed of the fluidized bed turntable to 120r / min, the air inlet at the bottom blows the urea particles to float and rotate randomly in the cavity at a certain angle and speed, and then spray 500g of acrylic resin ...

Embodiment 2

[0025] Embodiment 2: the preparation of coated nitrogen fertilizer sample B

[0026] Coated nitrogen fertilizer sample B was prepared according to the steps of Example 1, except that the coating coefficient was 1.6.

Embodiment 3

[0027] Embodiment 3: the preparation of coated nitrogen fertilizer sample C

[0028] Coated nitrogen fertilizer sample C was prepared according to the steps of Example 1, except that the coating coefficient was 1.8.

[0029] The coated nitrogen fertilizers A, B, and C obtained in Examples 1, 2, and 3 were dissolved in water at 25°C for dissolution experiments, and the initial dissolution rate of nitrogen was calculated. Simultaneously, the dissolution rate of nitrogen in the soil was carried out in simulated dry land. The results are shown in Table 1. The results show that the coated nitrogen fertilizer prepared by the method of the invention can well control the release rate of the fertilizer, and the release of the nitrogen fertilizer conforms to the two peaks of the corn's need for fertilizer, and the effect is good.

[0030] sample Coating coefficient Days required for 80% release of nitrogen (in water) Days required for 80% nitrogen release (in soil) ...

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PUM

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Abstract

The invention relates to a coated nitrogen fertilizer with regular release and a preparation method thereof. The nitrogen fertilizer comprises the following raw materials by weight ratio: 200 parts of common large granule urea (containing 46% of N), 8 parts of potassium sulfate or sodium sulfate, and 100 parts of acrylic resin. According to the invention, an organic substance and an inorganic substance are subjected to complex formulation to prepare a swelling material and a dressing material, the coated nitrogen fertilizer with regular release can be prepared by a coating mode, a nitrogen fertilizer release period is matched with twice fertilizer requirement peak times of corns. The screened swelling material and the dressing material are the natural materials or the easily available materials, which have the advantages of easy acquisition and low cost. On this base, the slow-release blending fertilizer has the advantages of low cost and little pollution on environment.

Description

Technical field [0001] The present invention involves a fertilizer and its preparation method. Specifically, it is a regular release of the envelope nitrogen fertilizer and its preparation methods. Background technique [0002] China is a large agricultural country with a population of 1.3 billion. In order to meet the needs of people's daily life, the stability and production of grain and production are an important issue for the development of my country's national economy. The use of chemical fertilizers has played a pivotal role in increasing the yield of grain crops.However, as one of the world's largest fertilizers and consumer countries, the utilization rate of chemical fertilizers in my country is at a low level. The waste of nutrient resources caused by chemical fertilizers in agricultural production is very amazing, and due to different fertilizers Environmental Pollution.In order to solve these problems brought about by traditional chemical fertilizers, since the 1970s...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05G3/08C05G3/80C05G3/90
Inventor 李筱琳陈智文崔运城李蒙王柏
Owner JILIN NORMAL UNIV
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