天然木粉在包裹控释尿素上的应用

为探究木质纤维素类有机物在缓/控释肥上的应用效果,采用静水浸泡法,研究了3种天然木粉包裹控释尿素(CRU20、CRU25、CRU30)在常温条件下的养分释放规律,以及不同温度、pH值和水肥比对控释尿素养分释放规律的影响。结果表明:1)包裹控释尿素的缓释期随着包裹量的增大而变长,CRU20、CRU25、CRU30的理论缓释期分别为36、54,121d,不同的包裹量表现出不同的释放曲线模式。2)氮素释放速率受温度和pH值的影响较大,不同水肥比的差异不明显。3)包裹控释尿素释放机理为"崩溃"机制。天然木粉包裹控释尿素具有很好的推广应用价值。

Application of natural wood flour on controlled-release urea

To explore the applied effects of lignocelluloses organic compounds on controlled-release fertilizer, three kinds of controlled-release urea coated with natural wood flour (CRU20, CRU25, CRU30) was examined by water-extraction method. The effects of temperature, pH and water-fertilizer ratio on the nutrient release characteristics of controlled-release urea were studied. The results showed that: 1) Controlled-release urea exhibited slow releasing performance, and the theoretical slow-release period of CRU20, CRU25, and CRU30 was 36, 54, and 121 days respectively, and the nitrogen-release model changed with the amount of coated materials; 2) Temperature and pH affected the nitrogen release rate greatly, while the impact of water-fertilizer ratio on nitrogen release rate was not obvious; 3) The release pattern of controlled-released urea coated with natural wood flour was failure mechanism. Controlled-release urea coated with natural wood flour provides a reference for applications.