滴灌施肥条件下红壤中磷的分布特征  

Phosphorus distribution in red soil with drip fertigation

作　　者：陈君梅[1] 叶娟[1] 郭彦彪[2] 戴林妹[1] 孙道宗[3] 

机构地区：[1]广东科学技术职业学院,广东广州510640 [2]华南农业大学资源环境学院,广东广州510642 [3]华南农业大学工程学院,广东广州510642

出　　处：《广东农业科学》2014年第15期52-55,共4页Guangdong Agricultural Sciences

基　　金：广东省农业科技推广项目(粤农计[2013]65号);广东省科技计划项目(2012B020301002)

摘　　要：采用模拟滴灌施肥方法,研究了200 mg/L和500 mg/L KH2PO4两种滴施磷肥浓度条件下磷素在红壤中的有效性及分布规律。结果表明,施肥浓度对全磷和有效磷在土壤剖面中的分布均有影响,随着距滴头距离的增加,全磷含量呈相对均匀的速率降低,而有效磷呈先快后慢的速率降低;高浓度施肥有利于磷素向距滴头更远处移动,且有助于提高土壤中有效磷含量。因此,滴灌施磷时建议采用较高磷浓度施用。By the method of simulating fertigation,the availability and distribution of phosphorus was studied when KH2PO4 was fertilized with the concentrations of 200 mg/L and 500 mg/L.The results showed that the distribution of total phosphorus and available phosphorus in the soil profile were effected by fertilizer concentration.With the increase of distance from the emitter,total phosphorus content decreased with relatively uniform rate,while the decrease trend of available phosphorus was rapid firstly and the became slow.With high concentration of phosphorus fertigating,phosphorus could move farther away from the emitter and available phosphorus content of soil also was higher.Therefore,high phosphorus concentration is suggested when phosphorus is fertilized by drip irrigation system.

关 键 词：红壤 滴灌 磷 迁移 

分 类 号：S275.6[农业科学—农业水土工程] S143.2[农业科学—农业工程]