Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (2): 283-291.doi: 10.3864/j.issn.0578-1752.2012.02.010

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Slow Release Characteristics of the Low Molecular Weight Polylactic Acid- Coated Urea and Its Reduction Effects on Soil Ammonia Volatilization

 LU Jing , LI  Dan, SUN  Jian-Bing, NI  Wu-Zhong   

  1. 1.浙江大学环境与资源学院/浙江省亚热带土壤与植物营养重点实验室，杭州 310029
  • Received:2011-01-21 Online:2012-01-15 Published:2011-05-16

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Abstract: 【Objective】 This paper presented an approach for preparing low molecular weight polylactic acid (PLA)- coated slow-release urea. The release behavior and reduction of ammonia volatilization after the coated urea added into soil were studied. 【Method】 By spouted-spraying methods, film coated urea fertilizers were prepared with two types of low molecular weight PLA (relative molecular weight-RMW5 000 and RMW10 000) respectively, retreated with paraffin wax as sealant or not, thus four types of coated urea were obtained. The structure of coating film was observed by scanning electronic microscopy (SEM), nitrogen release was investigated by a soil column leaching method, and ammonia volatilization was determined with an incubation experiment. 【Result】 SEM images showed that both of RMW5 000 and RMW10 000 PLA as a film coated on the surface of granular urea. Paraffin wax used as a sealant could fill up the micro holes or cracks in the coating film. Under the same nitrogen dose added, the amounts of total nitrogen leaching from soil column of the treatments with coated urea were significantly lower than that of the normal urea treatment, implying that the slow-release effectiveness of coated urea is clear. In the incubation experiment, it was found that nitrogen losses through ammonia volatilization of the treatments with coated urea were significantly lower than that of the urea treatment. 【Conclusion】 Low molecular weight PLA coated urea is a new environment-friendly type of slow-release fertilizer, and its application in sustainable agriculture is prospective.

Key words: low molecular weight polylactic acid, coated urea fertilizer, membrane structure, nitrogen release, ammonia volatilization

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