Effects of Soil Moisture Regimes on Leaf Water Deficit, Transpiration and Yield of Tomatoes

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Abstract
Summary Tomato plants in a glasshouse were subjected to four different water regimes based on soil moisture deficit, which was first estimated from evaporation from a simple evaporimeter and then checked by measurement in evapotranspiration gauges. The sensitivity of this species to small deficits was reflected in total yield, fruit size and incidence of blossom end rot. Although relative turgidity levels showed a relationship with soil moisture deficit, this relationship was modified by the stress regimes imposed. Transpiration rates fell with increasing deficit but, under conditions of frequent irrigation, showed good correlation with losses from evaporimeters, which in turn were closely related to incoming solar radiation.

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