On September 28th, the research and development of controlled-release fertilizers for easily biodegradable macromolecules, led by Prof. Hu Shuwen from the China National Agricultural University’s College of Resources and Resources, was approved by the Ministry of Education. Researchers have for the first time realized continuous, automated production of new easily degradable macromolecule coated controlled release fertilizers in the country. The process is safe and environmentally friendly. The production cost of the products is relatively low, the crop yield increase effect is obvious, and the polymer membrane materials used in China are currently Compared with the widely used controlled release material polyolefin, the environmental friendly performance is more prominent. Experts appraising that the results of the overall achievement of the international advanced level, has a good development prospects.
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Prof. Hu Shuwen and others completed the research and development of coated materials and the construction of coated controlled release fertilizer pilot production lines for three years. At present, 300 to 500 kg/hour continuous automated production lines have been operating more than 1,000 hours and provide more than 500 tons of test fertilizer products. According to reports, the easy-degradable polymer coated controlled-release fertilizer production technology has four major characteristics: First, the coating material has good biodegradability and controlled nutrient release, using only about 30% of the amount of polyolefin membrane material Can achieve the same controlled release effect, greatly reducing the amount of membrane material, reducing production costs; Second, fertilizer production to achieve continuous, automated, product controlled release type adjustable between 30 days to 180 days, the finished product quality is stable; The production does not use any inflammable or explosive solvent, nor does it produce "three wastes." Fourth, the product has obvious efficiency increase in Datian, and domestic tests show that it can be widely applied to various crops, especially field crops, to increase production. 9%-15%, even under the condition of 25% nitrogen reduction, can ensure stable production or increase production, and reduce the dual waste of resources and energy caused by excessive fertilization.
It is understood that the domestic technology of controlled-release fertilizers for in-situ film-forming coatings has lagged behind international standards. The easy-to-degrade macromolecule-coated controlled-release fertilizers are produced through the in-situ reaction of degradable monomers, and the small-molecule monomers are directly applied to fertilizers. Particle surface film. The polymer membrane prepared by this technology has biodegradability, and the weight loss rate in the soil in one year can reach 15% to 25%, and the environmental friendly performance is outstanding.
Xia Jingyuan, director of the National Agricultural Technology Extension Service Center, believes that this product has outstanding degradation performance and safety performance, and it has great technical advantages in promotion. Experts suggest that the next step can be to develop controlled release fertilizers and fertilization schemes for different crops, different soils, and different regions, and actively link up with nitrogen fertilizers and compound fertilizer companies to achieve standardized production of controlled release fertilizers.