Characteristics of NH4-N Releasing From Coated Slow-Release Urea with Organic-Inorganic Compound

ZOU Hong-tao;LI Wen;ZHANG Xi-chao;ZHANG Yan-ming;GAO Yi-wei;ZHANG Yu-long;College of Land and Environment/Ministry of Agriculture Key Laboratory for Northeast Preservation of Cultivated Land/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources,Shenyang Agricultural University;

organic-inorganic compound;;wrapped urea;;NH4-N;;release characteristics

This study aimed to investigate the effects of organic-inorganic compound as coated fertilizer material on nitrogen release, modified polyvinyl alcohol as a binder, celite, zeolite powder and carbonized rice husk powder as coated materials were made one kind of coated urea. The nutrients releasing characteristics were studied through the soil column leading test. The results showed that self-sustained-release coated urea had a significantly slow release effect, the maximum release rate decreased significantly and the peak time delayed significantly. The wrapping layer of organic-inorganic composite material could wrap the granular fertilizer completely, and the binder A is better than B, the wrapped material diatomaceous earth had a better effect than zeolite powder and carbonized rice husk. The slow release effect of the coated urea using polyvinyl alcohol modified by epoxy resin and celite as coated material was superior to the other treatment. Therefore, the composite material is more suitable for wrapped material to produce slow release fertilizer.