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《Shandong Agricultural Sciences》 2009-11
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Study on Nutrient Release Rule of Biodegradable Controlled-release Urea

LIN Hai-tao,JIANG Li-hua,LIU Zhao-hui*,ZHANG Wen-jun,ZHENG Fu-li,WANG Mei,SONG Xiao-zhong(Soil and Fertilizer Research Institute,Shandong Academy of Agricultural Sciences,Jinan 250100,China)  
Taking four kinds of biodegradable coated control-release urea(CU1,CU2,CU3,CU4) as testing materials,their nutrient releasing rules were studied by static water releasing test.The effects of different temperatures and soil moisture on the nutrient releasing of CU4 were also studied by static water release test and soil culture method respectively.The results showed that the nutrient releasing curve of CU1 and CU2 were in inverse "L" shape,while that of CU3 and CU4 were "S" shaped,which were in accordance with those of the non-biodegradable polymer-coated controlled-release urea.The early release ratios of the four kinds of controlled-release urea fertilizers were 0.07%~8.77%,while their differential release ratios were lower than 4% except CU1,in which,CU4 was the best with the lowest early release ratio and the best controlled-release effect,whose controlled release time was about 85 days.With the rising of the temperature,the nutrient release ratio could increase and the controlled release time could be shorted,while decreasing the soil moisture could decrease the nutrient release ratio and total rate.But increasing temperature and decreasing soil moisture could not change the type of nutrient release curve.
【Fund】: 国家科技支撑计划项目“设施菜地污染综合防控技术集成与示范”(编号 2006BAD17B07);; 山东省农业科学院青年基金“生物可降解型自控缓释肥包膜材料的筛选”;; 山东省农业科学院重大成果培育“环境友好型肥料研制与配套技术”项目资助
【CateGory Index】: S145.6
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