| Customization: | Available |
|---|---|
| CAS No.: | 7783-20-2 |
| Formula: | (Nh4)2so4 |
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Sulfur-coated nitrogen fertilizer, also known as Sulfur Coated Nitrogen Fertilizer in English, is a controlled-release fertilizer made by coating nitrogen fertilizers (usually urea) with sulfur and sealing agents such as polymer waxes through specific processes. The thickness of the sulfur coating varies, generally between 0.1 and 0.5 millimeters, and can be adjusted according to actual needs to precisely control the release rate of nitrogen.
After sulfur-coated nitrogen fertilizer is applied to the soil, moisture in the soil slowly penetrates into the sulfur coating layer. As water gradually dissolves the internal nitrogen fertilizer, the nitrogen fertilizer is released into the soil through micro-pores, cracks, and other channels on the sulfur coating layer under the pressure of osmosis. This process is influenced by various factors: thinner coatings allow easier penetration of moisture, resulting in faster release of nitrogen, while thicker coatings can extend the release time of nitrogen to several months; higher soil temperatures accelerate the movement of water, thus speeding up the release of nitrogen; high soil humidity also facilitates water penetration, promoting the release of nitrogen.
| nitrogen | 20.5% min |
| Size | 2.00-5.00mm |
| moisture | 1.0% maximum value |
| solubility | 99.5% minimum value |
| PH | 5.5 |
1.Significantly improved controlled-release properties: It can continuously and stably supply nitrogen according to the crop's different growth stages' needs, avoiding excessive nitrogen early on that causes excessive growth of crops, and insufficient nitrogen later that leads to premature aging. This ensures a high match between nitrogen supply and crop absorption patterns, greatly increasing nitrogen fertilizer efficiency. Compared to regular nitrogen fertilizers, its efficiency can be increased by 10%-30%.
2.Provides sulfur fertilizer benefits: while releasing nitrogen, it also supplements sulfur to the soil. Sulfur is a secondary essential nutrient for crop growth, participating in physiological processes such as protein synthesis and photosynthesis, which helps enhance crop stress resistance and improve the quality of agricultural products, especially suitable for the sulfur-deficient soils commonly found in northern China.
3.Environmental advantages stand out: it reduces nitrogen loss caused by leaching, volatilization, etc., and lowers the risk of pollution to water bodies and the atmosphere. Studies show that compared to traditional nitrogen fertilizers, it can reduce nitrogen loss by 25%-50%, effectively preventing eutrophication of water bodies, reducing greenhouse gas emissions, and protecting the ecological environment.
4.Reducing fertilizer costs: Due to the slow release of nutrients, one application of fertilizer can meet crop needs for a longer period, reducing the number of applications and lowering labor costs. For example, in corn cultivation, traditional fertilization requires 3-4 times, while using sulfur-coated urea fertilizer only requires 1-2 times.
It is applicable to various soils and crops, especially showing obvious effects on sulfur - loving crops such as onions, ginger, garlic, and peppers. When applied to alkaline and sulfur - deficient soils, it can supplement both nitrogen and sulfur elements simultaneously, improving soil properties and crop growth conditions.
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