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Superabsorbents and semiarid soil properties affecting water absorption
Year:
2011
Authors :
Levy, Guy
;
.
Shainberg, Isaac
;
.
Volume :
75
Co-Authors:
Yu, J., Institute of Water Resources, Huhhot, Inner Mongolia, 010020, China
Shainberg, I., Institute of Soil, Water and Environmental Sciences, Agriculture Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Yan, Y.L., Inner Mongolia Agricultural Univ., Huhhot 010018, China
Shi, J.G., Institute of Water Resources, Huhhot, Inner Mongolia, 010020, China
Levy, G.J., Institute of Soil, Water and Environmental Sciences, Agriculture Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Mamedov, A.I., USDA-ARS, Engineering and Wind Erosion, Research Unit, 1515 College Ave., Manhattan, KS 66502, United States
Facilitators :
From page:
2305
To page:
2313
(
Total pages:
9
)
Abstract:
Mixing cross-linked polyacrylamides with semiarid soils may increase water availability to crops. The effects of soils, sand, and superabsorbent properties on water absorption by four superabsorbent polymers (SAPs) were studied. The amount of water absorbed by the SAPs in tap water increased with increasing polymer cation exchange capacity. Less water was absorbed by SAPs mixed with soil or sand than by the control. In the sand and soil mixtures with a large-grain (3-4 mm) SAP, water absorption increased with time (up to 40-50 min) to a steady-state value in the range of 90 to 160 kg kg -1 in the sand-SAP mixture and 33-55 kg kg -1 in the soil-SAP mixture. Conversely, in the other three soil-SAP mixtures, water absorption reached a maximum value after 10 to 20 min, followed by a decrease with time to values ranging between 20 and 60 kg kg -1. At the initial stage of water absorption, confinement of the SAP grains by the soil particles was the dominant factor limiting water absorption by these SAPs; the confinement increased as soil texture became finer. The subsequent observed reduction was ascribed to the gradual replacement of Na or K cations that were adsorbed on the SAPs with Ca and Mg cations released from the soil. The results suggest that addition of a small amount of SAP to soils (5 g kg -1 soil) is more effective at increasing water holding capacity in soils with low clay content than in soils with high clay content. © Soil Science Society of America, 5585 Guilford Rd., Madison WI 53711 USA. All rights reserved.
Note:
Related Files :
absorbance
Adsorption
Cross-linked polyacrylamides
Soil particles
Soils
Superabsorbent polymer
Superabsorbent properties
water availability
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Related Content
More details
DOI :
10.2136/sssaj2010.0397
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29512
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:47
Scientific Publication
Superabsorbents and semiarid soil properties affecting water absorption
75
Yu, J., Institute of Water Resources, Huhhot, Inner Mongolia, 010020, China
Shainberg, I., Institute of Soil, Water and Environmental Sciences, Agriculture Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Yan, Y.L., Inner Mongolia Agricultural Univ., Huhhot 010018, China
Shi, J.G., Institute of Water Resources, Huhhot, Inner Mongolia, 010020, China
Levy, G.J., Institute of Soil, Water and Environmental Sciences, Agriculture Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
Mamedov, A.I., USDA-ARS, Engineering and Wind Erosion, Research Unit, 1515 College Ave., Manhattan, KS 66502, United States
Superabsorbents and semiarid soil properties affecting water absorption
Mixing cross-linked polyacrylamides with semiarid soils may increase water availability to crops. The effects of soils, sand, and superabsorbent properties on water absorption by four superabsorbent polymers (SAPs) were studied. The amount of water absorbed by the SAPs in tap water increased with increasing polymer cation exchange capacity. Less water was absorbed by SAPs mixed with soil or sand than by the control. In the sand and soil mixtures with a large-grain (3-4 mm) SAP, water absorption increased with time (up to 40-50 min) to a steady-state value in the range of 90 to 160 kg kg -1 in the sand-SAP mixture and 33-55 kg kg -1 in the soil-SAP mixture. Conversely, in the other three soil-SAP mixtures, water absorption reached a maximum value after 10 to 20 min, followed by a decrease with time to values ranging between 20 and 60 kg kg -1. At the initial stage of water absorption, confinement of the SAP grains by the soil particles was the dominant factor limiting water absorption by these SAPs; the confinement increased as soil texture became finer. The subsequent observed reduction was ascribed to the gradual replacement of Na or K cations that were adsorbed on the SAPs with Ca and Mg cations released from the soil. The results suggest that addition of a small amount of SAP to soils (5 g kg -1 soil) is more effective at increasing water holding capacity in soils with low clay content than in soils with high clay content. © Soil Science Society of America, 5585 Guilford Rd., Madison WI 53711 USA. All rights reserved.
Scientific Publication
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