摘要
在室内采用土柱模拟滴灌施P肥,研究了P在土壤中的移动和分布。试验结果表明:①滴施含P量200mg/L的KH2PO4后P在砂壤土、轻壤土、重壤土中分别纵向移动了22、16、14cm。横向和纵向移动的距离基本相同。②随着滴施P浓度的增加,P的移动距离增大,P的主要累积层加深。赤红壤中滴施P浓度200、400、800、1000mg/L时,P分别移动了12、16、20、22cm,而且有效P和全P含量增加显著的土层深度分别为0～8、0～12、0～18、0～20cm。在相同质地情况下,滴施高浓度P肥溶液可以明显增加P的移动距离。
In order to evaluate the movement and distribution of phosphorus fertilizers in soils under drip fertigation,a soil column experiment was conducted to simulate drip fertigation.The results indicated that：（1） KH2PO4 moved vertically 22 cm in sandy loam soil,16 cm in light loam soil and 14 cm in clay loam soil,respectively;P moved similar distance both in vertical and horizontal direction.（2） In lateritic soil,the higher P concentration was,the longer distance P moved in vertical direction.In terms of available P,vertical P movement in treatments of 200,400,800 and 1 000 mg/L were 12,14,20 and 22 cm,respectively;Both of total P and available P were significantly concentrated in the layer of 0 -8,0 -12,0 -18 and 0 -20 cm in the treatments of 200,400,800 and 1 000 mg/L,respectively.It is concluded that drip fertigation with high P concentration solution could increase the distance of P movement
出处
《土壤》
CAS
CSCD
北大核心
2010年第6期941-945,共5页
Soils
基金
广东省教育部产学研结合项目(2009B090300332)
农业部公益性行业(农业)科研专项经费项目(200803030)资助
关键词
滴灌
土壤
磷
移动
Drip fertigation
Soil
Phosphorus
Movement
