A comparison of soil- and canopy temperature-based methods for the early detection of water stress in a simulated patch of pasture |
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| Authors: | Cecilia Stanghellini Francesca De Lorenzi |
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| Institution: | (1) Institute of Agricultural Engineering (IMAG-DLO), P.O. Box 43, 6700 AA Wageningen, The Netherlands;(2) Irrigation Institute (ISPAIM-CNR), via Cupa Patacca 85, I-80056 Ercolano, NA, Italy |
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| Abstract: | This paper evaluates the sensitivity of two different methods of water stress detection in a simulated patch of pasture grown in a greenhouse. The performance of two indices, based respectively on canopy temperature and soil water content values — the latter gauged by means of a time domain reflectometry (TDR) system, was assessed against actual evapotranspiration, measured by a very accurate weighing system. Both methods were able to detect water shortage by the time transpiration was reduced to some 80% of its potential value. The soil-based index, however, relied on the estimate of root water extraction rate, which may not be known. It is concluded that detection of water shortage by means of a canopy temperature-based stress index is to be preferred to measuring soil water deficits by time domain reflectometry, despite the accuracy of the TDR-based soil water content estimate. |
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