Coated nitrogen fertilizer with regular release and preparation method thereof

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...

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 sufficient fertilizer, which may destroy the normal development of the plant root system, and instead affect the normal growth of the plant.

Therefore, such a method of fertilization not only wastes a lot of manpower, material and financial resources, but also reduces agricultural production efficiency to a certain extent.

[0007] Fourth, it is very easy to cause environmental pollution

Secondly, the application of chemical fertilizers will also reduce the activity of microorganisms, making it difficult for many substances in the soil to be transformed and degraded.

Third, long-term application of nitrogen fertilizers will also cause soil nutritional imbalance, aggravate the depletion of soil phosphorus and potassium, and lead to a large amount of nitrate accumulation in the soil

Finally, long-term application of chemical fertilizers can also cause accelerated soil acidification, thereby reducing soil fertility