נגישות
menu      
Advanced Search
Syntax
Search...
Volcani treasures
About
Terms of use
Manage
Community:
אסיף מאגר המחקר החקלאי
Powered by ClearMash Solutions Ltd -
Aggregate stability as affected by polyacrylamide molecular weight, soil texture, and water quality
Year:
2007
Authors :
Levy, Guy
;
.
Volume :
71
Co-Authors:
Mamedov, A.I., USDA-ARS, National Soil Erosion Research Lab., Purdue Univ., 275 S. Russell St., West Lafayette, IN 47907-2077, United States, Wind Erosion Research Unit, USDA-ARS-NPA, Manhattan, KS 66502, United States
Beckmann, S., Univ. of Regensburg, Dep. of Landscape Ecology and Soil Science, Regensburg, Germany
Huang, C., USDA-ARS, National Soil Erosion Research Lab., Purdue Univ., 275 S. Russell St., West Lafayette, IN 47907-2077, United States
Levy, G.J., Institute of Soil, Water and Environmental Sciences, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
1909
To page:
1918
(
Total pages:
10
)
Abstract:
The favorable effects of the environmentally friendly, nontoxic, anionic Polyacrylamide (PAM) as a soil conditioner have long been established. Some uncertainties exist, however, regarding the effects of PAM molecular weight (MW) on its performance as a soil amendment and its ability to penetrate into aggregates and stabilize interior surfaces. We studied the effects of two anionic polymers, a high-MW (12 × 106 Da) and a medium-MW (2 × 105 Da) PAM, using deionized water (electrical conductivity of 0.004 dS m-1) or a 15 mmol L-1 gypsum solution, on the stability of aggregates from four smectitic soils varying in clay content. Penetration of PAM into the aggregates was estimated from treating 0.5- to 1.0- and 1.0- to 2.0-mm aggregates with PAM and thereafter comparing the stability of the small aggregates to that of the large aggregates after the latter had been crushed and sieved to 0.5- to 1.0-mm size. The stability ratio (SR) ranged from 0.090 to 0.900 and tended to (i) increase with the increase in soil clay content, (ii) maintain, in the absence of PAM, a greater level with electrolyte solution than deionized water, and (iii) be greater for the PAM-treated aggregates than the control. In the finer textured soils, the SR of the initially small aggregates was generally greater than that of the initially large aggregates, indicating that most of the PAM was adsorbed on the exterior surfaces and only a small fraction of the PAM added, if any, entered into pores. A significant interaction among the treatments tested (PAM MW, aggregate size, and solution ionic strength), with respect to their effect on the SR, was identified. Consequently, neither of the two PAM polymers tested could have been singled out as preferable. © Soil Science Society of America. All rights reserved.
Note:
Related Files :
Aggregate size
Gypsum
Negative ions
Polyacrylates
polymer
soil amendment
soil surveys
soil texture
Show More
Related Content
More details
DOI :
10.2136/sssaj2007.0096
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
30492
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:55
Scientific Publication
Aggregate stability as affected by polyacrylamide molecular weight, soil texture, and water quality
71
Mamedov, A.I., USDA-ARS, National Soil Erosion Research Lab., Purdue Univ., 275 S. Russell St., West Lafayette, IN 47907-2077, United States, Wind Erosion Research Unit, USDA-ARS-NPA, Manhattan, KS 66502, United States
Beckmann, S., Univ. of Regensburg, Dep. of Landscape Ecology and Soil Science, Regensburg, Germany
Huang, C., USDA-ARS, National Soil Erosion Research Lab., Purdue Univ., 275 S. Russell St., West Lafayette, IN 47907-2077, United States
Levy, G.J., Institute of Soil, Water and Environmental Sciences, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Aggregate stability as affected by polyacrylamide molecular weight, soil texture, and water quality
The favorable effects of the environmentally friendly, nontoxic, anionic Polyacrylamide (PAM) as a soil conditioner have long been established. Some uncertainties exist, however, regarding the effects of PAM molecular weight (MW) on its performance as a soil amendment and its ability to penetrate into aggregates and stabilize interior surfaces. We studied the effects of two anionic polymers, a high-MW (12 × 106 Da) and a medium-MW (2 × 105 Da) PAM, using deionized water (electrical conductivity of 0.004 dS m-1) or a 15 mmol L-1 gypsum solution, on the stability of aggregates from four smectitic soils varying in clay content. Penetration of PAM into the aggregates was estimated from treating 0.5- to 1.0- and 1.0- to 2.0-mm aggregates with PAM and thereafter comparing the stability of the small aggregates to that of the large aggregates after the latter had been crushed and sieved to 0.5- to 1.0-mm size. The stability ratio (SR) ranged from 0.090 to 0.900 and tended to (i) increase with the increase in soil clay content, (ii) maintain, in the absence of PAM, a greater level with electrolyte solution than deionized water, and (iii) be greater for the PAM-treated aggregates than the control. In the finer textured soils, the SR of the initially small aggregates was generally greater than that of the initially large aggregates, indicating that most of the PAM was adsorbed on the exterior surfaces and only a small fraction of the PAM added, if any, entered into pores. A significant interaction among the treatments tested (PAM MW, aggregate size, and solution ionic strength), with respect to their effect on the SR, was identified. Consequently, neither of the two PAM polymers tested could have been singled out as preferable. © Soil Science Society of America. All rights reserved.
Scientific Publication
You may also be interested in