Crop Evapotranspiration Estimation for Wheat ( Triticum aestivum L.) Using Remote Sensing Data in Semi-Arid Region of Ma
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RESEARCH ARTICLE
Crop Evapotranspiration Estimation for Wheat (Triticum aestivum L.) Using Remote Sensing Data in Semi-Arid Region of Maharashtra S. A. Kadam1 • S. D. Gorantiwar1 • S. N. Das2 • A. K. Joshi3
Received: 28 January 2015 / Accepted: 12 May 2016 Ó Indian Society of Remote Sensing 2016
Abstract Penman–Monteith method adapted to satellite data was used for the estimation of wheat crop evapotranspiration during the entire growth period using satellite data together with ground meteorological measurements. The IRS-1D/IRS-P6 LISS-III sensor data at 23.5 m spatial resolution for path 096 and row 059 covering the study area were used to derive, albedo, normalized difference vegetation index, leaf area index and crop height and then to estimate wheat crop evapotranspiration referred to as actual evapotranspiration (ETact). The ETact varied from 0.86 to 3.41 mm/day during the crop growth period. These values are on an average 16.40 % lower than wheat crop potential evapotranspiration (ETc) estimated as product of reference crop evapotranspiration estimated by Penman–Monteith method and lysimetric crop coefficient (Kc). The deviation of ETact from ETc is significant, when both the values were compared with t test for paired two sample means. Though the observations on ETact were taken from well maintained unstressed experimental plot of 120 9 120 m size, there was significant deviation. This deviation could be attributed to, the satellite images representing the actual crop evapotranspiration as function crop canopy biophysical parameters, condition of the crop stand, climatic and soil conditions and the microclimate variation over area of
& S. A. Kadam [email protected] 1
AICRP on Groundwater Utilization, Deparment of Irrigation and Drainage Engineering, Mahatma Phule Krishi Vidyapeeth, Rahuri, Ahmednagar, Maharashtra 413 722, India
2
Maharashtra Remote Sensing Application Centre, Nagpur, India
3
Regional Remote Sensing Centre-Central, Nagpur, India
one hectare. However, Penman–Monteith method represents a flat rate of specific growth stage of the crop. Keywords Remote sensing Crop evapotranspiration Wheat Penman–Monteith method
Introduction Reliable estimation of evapotranspiration (ET) is of great importance for the computation of irrigation water requirements, water resources management and determination of water budget especially under arid and semi-aird conditions where water resources are scarce and fresh water is a limited resource. Accurate estimation and mapping of ET is important for society since it allows decision makers and stakeholders (1) to follow where, when and how much water has moved into the atmosphere by evaporation; (2) to monitor crop performance and the effect of droughts for famine prediction; (3) to better evaluate the performance of irrigation system; and (4) to enhance the weather prediction and increase our understanding of climate change. However, ET is a complex function of soil properties, atmospheric conditions, land use, vegetation and topography which causes
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