Biodegradable polymer layers for production of smart urea fertilizer by coating pan system
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nguyenhuutrungtt@gmail.comKeywords:
coating pan system, green agricultural production, modified starch, release, smart ureafertilizerAbstract
This paper presents the results of synthesis of biodegradable polymer layers from modified starch, coated urea technology by coating pan system and evaluates the efficiency of smart urea fertilizers (SUFs) experimentally. The results indicate that graft copolymers of polymer photsphated starch crossed linked with polyvinyl alcohol and polyacrylic acid helps slowing the release of urea through the layer into the environment. SUFs were produced by a coating pan has diameter 0.2 m, speed is 50 rpm, angle of inclination 40°, dry temperature 60°C. Release efficiency of SUF with the synthetic layer is evaluated by the time that 70% of urea was released, was up to 360 minutes and more than 60 times the uncoated urea fertilizer. The paper also presents the results of urea concentration of SUFs released in soil environment and the release rate is 8.5 ppm/day. They are the basis for the production and use of SUFs in green agricultural production
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