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598472 
Journal Article 
Evaluation of Hydrogel Application on Soil Water Retention Characteristics 
Abedi-Koupai, J; Sohrab, F; Swarbrick, G 
2008 
Yes 
Journal of Plant Nutrition
ISSN: 0190-4167
EISSN: 1532-4087 
31 
2 
317-331 
Hydrogels can absorb irrigation and rain water and help to reduce deep percolation by using gravitational water as well as capillary water. The objective of this study was to evaluate the effect of hydrogels on soil water retention characteristic curve (WRC) using RETC computer model. The hydrogels, PR3005A and Tarawat A100 in four levels, 2, 4, 6, and 8 g/kg, were mixed with three soil textures, sandy loam, loamy and clay. The results showed that for each texture, hydrogels caused the residual water content (θr) and saturated water content (θs) to increase. Air entry value (hb), was observed to increase in sandy loam soil and decrease in the other soils. The results of the statistical analysis showed that there is significant difference between samples containing hydrogels and the control (without hydrogels) due to both the level of hydrogel application, and the type of hydrogel applied Available water content increased 1.8 fold of control in clay and 2.2 to 3.2 fold in loamy and sandy loam soil, respectively, with a hydrogel application of 8 g/kg. [ABSTRACT FROM AUTHOR] Copyright of Journal of Plant Nutrition is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts) 
COLLOIDS; SOIL moisture; SOIL aeration; PLANTS -- Nutrition; PLANTS -- Water requirements; LAND capability for agriculture; air-entry value; polyacrylamides (PAM); RETC; Soil water retention models