Ender MT, Peppsa NA. Transport of Ionizable drugs and protein in crosslinked poly and polycarrylic acid - cohydroxyethyl methacrylate hydrogels, ⅡDiffusion and release studies[J]. Journal of Controlled Release, 1997, 48:47 - 56.
[2]
Tang hui, Wang ya ming, et. Studies on the urea coated with tung oil as coating materials [J]. Journal of Yunnan University, 2004, 26 (2) :150 - 153.
[3]
Tremble ME. Improving fertilizer use efficiency - controlled and stabilized fertilizer in agriculture [M]. paris: International fertilize Industry Association, 1997. 11 - 12.
[4]
Jiao xiaoguang, Liang wenjv. Effect of controlled urea on urea N transformation and yied [J]. System Sciences and Comprehensive Studies,2003, 19(4): 297 - 299.
