Last week, the reporter learned from the seminar on the development of new chemical fertilizers held by the China National Nitrogen Fertilizer Industry Association that there has been a new breakthrough in the coating materials for domestic controlled release fertilizers. Sulfur-coated urea is combined with bio-carbon energy technology to produce new carbon-sulphur-coated urea, which can effectively reduce the loss, leaching and volatilization of fertilizers, save 30% to 40% of fertilizer, and simultaneously increase the urea content in rice. The utilization rate has increased from about 30% to 50% to 60%.
According to Li Tianbing, director of the general manager office of Hanfeng Sustained Release Fertilizers (Jiangsu) Co., Ltd., this technology uses patented microcrystalline paraffin wax and carbon as the sulfur coating outer coating, which fully guarantees the controllability of nutrient release from fertilizers. The nutrient released is more efficiently transported into the plant and transformed, promoting the growth of the plant's primary and root hairs, making the root system coarse and coarse, and increasing the absorption capacity.
According to reports, the carbon energy used in this technology is extracted from natural plants and contains 2,388 active ingredients that can be absorbed by plants together with nutrients, activate plant potential, and promote physiological and biochemical reactions of plant cells and various invertase enzymes. Improve the ability of plants to take up nutrients, improve the activity of nutrients in plants, meet the full nutritional needs of crop growth, and can effectively promote the improvement of crop resistance, maximize the crop gene potential.
Sulfur-coated urea is currently the most common slow-release fertilizer in China. The production technology of this product is relatively mature and the cost is relatively low. The objective is to delay the dissolution of nitrogen fertilizer by coating a layer of sulfur outside the nitrogen fertilizer. In addition, thiosulfate, an intermediate in the conversion of sulfur in soil, can suppress the loss of nitrogen, increase the nitrogen absorption efficiency of crops, and can significantly increase the number of soil microorganisms and the activity of various enzymes. However, the sulfur intensity is relatively low, and the coating formed from sulfur is relatively easy to be broken in the process of packaging, handling and application, thereby losing the effect of slow and controlled release.
Zhang Min, a professor at the College of Resources and Environment of Shandong Agricultural University, told reporters that in addition to the carbon and sulfur coating, attempts to wrap other materials on the outer layer of the sulfur coating have begun. At present, sulfur-plus-resin composite coating controlled release fertilizer technology has achieved industrial production in China, but the production cost of resin raw materials is high, and the degradation is slow in soil, which may easily cause secondary pollution. Research on the synthesis of vegetable oil-based polyesters, polyurethanes, and other easily degradable, low-cost renewable coating materials has also made initial progress, but due to its direct use as a membrane material, it is slow drying, slow release properties, and low cross-linking, mechanical properties. Poor and other restrictions have failed to achieve industrialization.
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