摘要
以自然资源“桐油”为包膜材料(从油桐果实中提取),生产包膜肥料,采用室外盆栽试验方法,研究了不同固化时间对包膜肥料养分释放速率的影响。结果表明,2003年7月测定包膜尿素初溶出率为12.6%,2004年4月测定其初溶出率为0%。根据LOGISTIC生长曲线模型进行模拟,2003年7月测定值模拟后,其最大养分释放量为98.8%;2004年4月测定,其最大养分释放量为98.4%。固化期为3个月时,肥料的养分释放期为41.8d,其日释放速率为0.11;固化期为12个月时,肥料的养分释放期为218.5d,其日释放速率为0.021。说明以桐油为包膜材料的包膜尿素,具有良好的缓释性,在生产应用中,要严格注意包膜肥料的生产日期。
Urea was treated with tung oil as a coating material, forming coated-released-fertilizer in our lab. We tested release of nutrient from the coated urea with various solidifying periods at a growing tobacco using a pot experiment. The soil in the pot was kept at temperature of 15 ℃～22 ℃and humidity of 37%, respectively. The times of measurement for rates of nutrient released from the coated urea were done in July 2003 and April 2004, respectively. Theresults showed that the nutrient released from the ncoated urea initially was 12.6%in July 2003 and 0%in April 2004. According to imitation curve of growth of LOGISTIC, the biggest released nutrient from the coated urea accounted for98.8%after the first determination in July 2003, while in April 2004 was 98.4%. The period of nutrient released was 41.8 days with the rate of releasing 0.11 days for the urea with 3 month solidifying period; while 218.5 days with therate of 0.021 days for that with 12 month solidifying period. It may be concluded that the urea coated with tung oil as coating material can have beneficial properties for both agronomy and environment, as controlled release of nutrients form the urea can not only prevent applied fertilizer from pollution on aquatic system, but also enhance efficiency of the fertilizer.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2005年第1期139-142,共4页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(20264002)
关键词
固化周期
养分释放
影响
solidifying period
releases of nutrient
influence
tung oil
