Estimation of soil water deficit in an irrigated cotton field with infrared thermography

Padhi, J. and Misra, R. K. and Payero, J. O. (2012) Estimation of soil water deficit in an irrigated cotton field with infrared thermography. Field Crops Research, 126 (1). pp. 45-55. ISSN 0378-4290

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Abstract

Plant growth and soil water deficit can vary spatially and temporally in crop fields due to variation in soil properties and/or irrigation and crop management factors. We conducted field experiments with cotton (Gossypium hirsutum L.) over two seasons during 2007-2009 to test if infrared thermography can distinguish systematic variation in deficit irrigation applied to various parts of the field over time. Soil water content was measured with a neutron probe and thermal images of crop plants were taken with a thermal infrared camera. Leaf water potential and stomatal conductance were also measured on selected occasions. All measurements were made at fixed locations within three replicate plots of an irrigation experiment consisting of four soil-water deficit treatments. Canopy temperature related as well with soil water within the root zone of cotton as the stomatal conductance index derived from canopy temperature, but it neglected the effect of local and seasonal variation in environmental conditions. Similarities in the pattern of spatial variation in canopy temperature and soil water over the experimental field indicates that thermography can be used with stomatal conductance index to assess soil water deficit in cotton fields for scheduling of irrigation and to apply water in areas within the field where it is most needed to reduce water deficit stress to the crop. Further confidence with application of infrared thermography can be gained by testing our measurement approach and analysis with irrigation scheduling of other crops.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author's Accepted Version deposited in accordance with the copyright policy of the publisher. Author's personal copy (provided by the publisher) is available with the corresponding author.
Depositing User: Dr Rabi Misra
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 02 Sep 2012 05:32
Last Modified: 21 Jul 2014 04:00
Uncontrolled Keywords: canopy temperature; irrigation; leaf water potential; soil water deficit; stomatal conductance; stomatal conductance index; thermal imagery
Fields of Research (FOR2008): 06 Biological Sciences > 0607 Plant Biology > 060705 Plant Physiology
05 Environmental Sciences > 0503 Soil Sciences > 050305 Soil Physics
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9609 Land and Water Management > 960905 Farmland, Arable Cropland and Permanent Cropland Water Management
D Environment > 96 Environment > 9614 Soils > 961402 Farmland, Arable Cropland and Permanent Cropland Soils
B Economic Development > 82 Plant Production and Plant Primary Products > 8203 Industrial Crops > 820301 Cotton
Identification Number or DOI: 10.1016/j.fcr.2011.09.015
URI: http://eprints.usq.edu.au/id/eprint/21266

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