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This paper reviews the various methods available for irrigation scheduling, contrasting traditional …

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Figures
- Irrigation scheduling: advantages and pitfalls of plant-based methods

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Fig. 1. Generalized sensitivities of plant processes to water deficits (modified with permission from Hsiao, 1973).

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Fig. 2. (A) Illustration of the calculation of Idso's Crop Water Stress Index: CWSI=(T_canopy–T_nws)/(T_dry–T_nws), showing the dependence of T_nws (– – –) and T_dry (- - -) on air vapour pressure deficit (vpd, kPa). (B) Illustration of the effect of a given experimental ‘noise’ (for example resulting from measurement errors and variations in irradiance), indicated by the double-headed arrow, showing that the signal-to-noise ratio decreases markedly as the vpd decreases from levels found in hot and arid/semi-arid climates to values typical in humid or maritime climates.