摘要
This study aimed to investigate the release properties of slow release ure- a coated by industrial lignin and the influences of temperature, pH and post-ripening period on the release of nutrients in coated urea. According to the experimental results, the release of nutrients in coated fertilizers showed an S-shaped curve; on the 28th d, the nutrient release rate reached 73.77%; the differential solubility was 1.83%, and the theoretical release period was 50.25 d. The release of nutrients was significantly influenced by temperature. As the incubation temperature rose from 25 to 40 ℃, preliminary solubility increased from 8.03% to 16.24%; differential solubility increased from 1.83% to 1.88%; theoretical release period was reduced from 51.25 d to 45.55 d. The release of nutrients was promoted by H＋ and OH-. After they were placed at room temperature within 30 d, coated fertilizers exhibited the optimal release properties.
为了探明工业木质素包膜缓释肥料的养分释放规律,以及温度、pH和后熟期对于包膜尿素养分释放的影响,进行了一系列的试验。实验结果表明:包膜尿素养分释放曲线呈"S"型,28 d养分释放率达到73.77%,养分微分溶出率为1.83%,理论释放时间为50.25 d。当温度对于养分的释放影响是十分显著的。当培养温度由25℃提高到40℃时,养分的初期溶出率由8.03%提升到16.24%,微分溶出率由1.83%变为1.88%,理论养分释放期由51.25 d缩短至45.55 d。H+和OH-的存在均会促进养分的释放。当室温放置时间为30 d内时,肥料的缓释性能是最佳的。
基金
Supported by Fund for Transformation of Scientific and Technological Achievements(2011GB24910009)
Key Project of National Science&Technology Pillar Program(2011BAC11B01)
Science and Technology Cooperation Program of Chinese Academy of Sciences and Hubei Province(YD20111215)~~
