土壤类型和含水量对包膜尿素养分释放特征的影响  

Effects of Soil Type and Water Content on Nutrient Release Characteristics of Coated Urea

作　　者：谭美 江涛 戴美玲 何伟豪 刘文 向铁军 TAN Mei;JIANG Tao;DAI Mei-ling;HE Wei-hao;LIU Wen;XIANG Tie-jun(Hunan Gold Leaf Public Expectation Technology Co.,Ltd.,Linxiang 414300,PRC)

机构地区：[1]湖南金叶众望科技股份有限公司,湖南临湘414300

出　　处：《湖南农业科学》2019年第7期44-47,共4页Hunan Agricultural Sciences

基　　金：国家重点研发计划项目(2017YFD0200705)

摘　　要：包膜肥料中养分释放快慢和释放期长短直接关系到肥料的利用效率和植物的生长,以包膜尿素为材料,研究不同土壤类型对包膜尿素养分释放特征的影响。结果表明:包膜尿素在3种作物种植地(水稻、蔬菜和茶树)土壤中养分释放最快的为稻田土,土壤表面和里面平均初期溶出率为11.88%,28d平均养分累计释放率为61.32%,释放期为123d;不同土壤含水量(20%、40%和60%)下,包膜尿素养分释放特性表现为随着土壤含水量的增加,养分释放速度逐渐加快;撒施在土壤表层的包膜尿素氮素释放率略低于埋入土层内部的。The release rate of nutrients and the length of release period in coated fertilizers are directly related to fertilizer utilization efficiency and plant growth.In our experiment,the influence of soil types on characteristics and velocity of nutrient release of coated urea was studied.The results showed that the fastest nutrient release of coated urea was paddy soil in three planting areas(rice,vegetable and tea garden),the primary dissolution rate of soil surface and inside was 11.88%averagely,the cumulative release rate of nutrients was 61.32%at 28 d,and the release period was 123 d;the nutrient release characteristics of coated urea under different soil moisture contents(20%,40%and 60%)showed that the release rate of nutrients gradually increased with the increase of soil water content;the nitrogen release rate of coated urea applied to the surface layer of soil was significantly lower than inside the soil.

关 键 词：土壤 包膜尿素 养分释放率 

分 类 号：S14-3[农业科学—肥料学]