Effect of soil moisture on transpiration.

Abstract

The march of soil moisture content in an experimental citrus grove was determined by successive soil sampling. Following an irrigation the soil moisture content progressively falls owing to withdrawal of water by the plants. It was found that the soil moisture content could be expressed as an exponential function of the accumulated evaporation from a free water surface since the last irrigation. Curves of this type were constructed for the three kinds of cultural treatment studied. The rate of water withdrawal is a function of the soil moisture content.