Effects of bentonite on water infiltration in a loamy sand soil

被引:11
作者
Talebnezhad, Rezvan [1 ]
Sepaskhah, Ali Reza [1 ]
机构
[1] Shiraz Univ, Irrigat Dept, Shiraz, Iran
关键词
infiltration rate; soil conditioners; furrow irrigation; irrigation application efficiency; HYDRAULIC CONDUCTIVITY; POLYACRYLAMIDE;
D O I
10.1080/03650340.2012.708926
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Water loss as deep percolation is considerable in furrow irrigation in light soils due to the high infiltration rate. Application of soil conditioners such as bentonite reduces the infiltration rate and improves irrigation application efficiency (E-a) in these soils. The effects of bentonite application rates (BAR) of 0, 2, 4 and 6gL(-1) on infiltration of a loamy sand soil were determined in a soil column in the laboratory. The exponent of the Kostiakov infiltration equation was not influenced by BAR. Maximum reduction in infiltration equation coefficient and final infiltration rate (i(f)) occurred with 2gbentoniteL(-1) and this reduction was lower on increasing BAR from 2 to 4 and 4 to 6gL(-1) compared with control. The effect of 2gL(-1) BAR on infiltration and its effect on the design of furrow irrigation in a field with a loamy sand soil indicated that in the first irrigation after field ploughing and seed planting, longer furrow length, lower deep percolation and higher E-a are obtained.
引用
收藏
页码:1409 / 1418
页数:10
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