Effect of gypsum and polyacrylamides on water turbidity and infiltration in a sodic soil
Sivapalan, Siva (2005) Effect of gypsum and polyacrylamides on water turbidity and infiltration in a sodic soil. Australian Journal of Soil Research, 43(6), pp. 723-733.
Water ponded on sodic soils can develop turbidity problems which seriously affect rice crop establishment. A total of 19 polyacrylamide products were tested to assess their effectiveness to control water turbidity in a sodic soil under laboratory conditions. Anionic polyacrylamides were more effective than cationic or non-ionic polyacrylamides. When combined with gypsum, polyacrylamides were found to be more effective than applied alone. A split application strategy was more efficient than continuous application of polyacrylamide treatments. Different rates of polyacrylamides at 2.5, 5 and 10 kg/ha did not show significant difference in controlling water turbidity. Selected polyacrylamides were also tested on soil columns to study their effect on infiltration and percolation of water through the soil. Results have shown that polyacrylamides combined with low rates of gypsum did not modify the infiltration pattern to a greater extent. This study demonstrated that anionic polyacrylamides applied with small quantities of gypsum through a split application strategy would be an appropriate technique to overcome water turbidity problems in sodic soils.
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|Item Type:||Journal Article|
|Keywords:||sodicity, nephelometric turbidity units, rice establishment|
|Subjects:||Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000) > SOIL SCIENCES (050300) > Soil Chemistry (excl. Carbon Sequestration Science) (050304)
Australian and New Zealand Standard Research Classification > AGRICULTURAL AND VETERINARY SCIENCES (070000) > CROP AND PASTURE PRODUCTION (070300) > Agronomy (070302)
Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000) > SOIL SCIENCES (050300) > Soil Physics (050305)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
|Copyright Owner:||Copyright 2005 CSIRO|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||21 Nov 2005|
|Last Modified:||09 Jun 2010 12:28|
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