In response to the problems of short release period of controlled-release fertilizers and difficult-to-degrade coating materials, China National Offshore Oil Corporation, CNOOC Chemical Co., Ltd. has developed the fourth-generation controlled-release fertilizer production technology. The preliminary experiments on crops such as corn, sugarcane, and banana in Shandong, Hunan, and Hainan indicated by the Institute of Resources and Regional Planning of the Chinese Academy of Agricultural Sciences and the South China College of Thermal Studies show that the utilization rate of fertilizers is increased by more than 20%, and the fertilizer efficiency of one application is as long as 2 to 6 In the month, it saves manpower and reduces the total cost of fertilizers. China Ocean Chemical's 5,000 tons/year controlled-release fertilizer pilot project was successfully launched one day before. Up to now, nearly 20 tons of qualified products have been produced, which means that China has mastered the leading international fourth-generation controlled-release fertilizer production technology.
Dr. Bing Shen of China National Chemical Technology Development Department told the reporter that the current utilization rate of chemical fertilizers in China is far lower than the level of the developed countries in the world. The loss of fertilizers not only wastes resources, but also results in the consolidation of land. The development of slow/controlled release fertilizers has become a national increase in fertilizer utilization. Important measures. He explained that China's controlled-release fertilizer development has experienced three stages: sulfur coating, polyolefin, and aqueous solution. The sulfur-coated type has a short release period and is likely to cause acidification of the soil; the polyolefin membrane material cannot be degraded and contaminate the soil; the production process of the aqueous emulsion is complicated and the membrane material is consumed. These are hard injuries that cannot be ignored. To this end, China Ocean Chemical introduced the vegetal resin coating technology of the national "Twelfth Five-Year Plan" science and technology support plan last year, and independently designed and developed a fourth-generation coated controlled-release fertilizer production line that is compatible with membrane materials and formed a complete Coated controlled release fertilizer production process.
Shen Bing said that the technology uses vegetable oils and esters as the main coating materials, and the coating process does not require any solvent. After the release of fertilizers, the coating materials will naturally degrade in 1 to 2 years, making controlled-release fertilizers production and use. More environmentally friendly. On the other hand, using the in-situ surface film-forming principle, small-molecule monomers are directly polymerized into a film on the surface of the fertilizer, and the amount of membrane material is small. Only 1 ton of fertilizer requires 30-50 kg of membrane material, and the cost control is in the leading position of the same technology.
In addition, the initial dissolution rate of coated fertilizers can be kept below 10%, which is suitable for the needs of different crops in different regions. At present, China Chemical has adopted a controlled release technology to produce a series of controlled-release fertilizers for bananas, pineapples and other crops. In Hainan's Linggao Sugarcane Demonstration Field, local farmers demonstrated to reporters demonstration effects: the diameter of a single sugar cane was 2.9 to 3.1 cm, and the length was more than 3 meters. The yield per hectare was 2 to 3 tons more than that of traditional fertilization. In the Chengyuan Banana Demonstration Field, Mr. Li, an agricultural technology promoter, said that in the past, a growing period of bananas required fertilization for 12 to 16 times or more, and the labor cost was very high. However, as long as the controlled-release fertilizer was fertilized 4 to 5 times, the promotion prospect was promising.
China Shipping Chemical revealed that the product will be sold under the Toshima brand and is currently being filed with the Ministry of Agriculture. Experts will be organized to conduct project identification in the near future.
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