The transpiration process as a function of environmental parameters Public Deposited

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  • The influence of soil moisture stress and soil temperature on transpiration has never been determined explicitly. This relationship has been neglected mainly because of the lack of a satisfactory method to control soil moisture stress. A technique was developed to evaluate this relationship by controlling soil moisture stress with osmotic solutions of Carbowax 6000 and controlling soil temperature with a water bath. Transpiration was determined by a constant water level device which recorded the total amount of water used by the plant. Assuming steady state conditions, the resistances occurring in the transpirational flow path were calculated using Fick's first law. The resistances occurring in the flow path were partitioned into three parts: (1) Leaf resistance, (2) boundary layer resistance and (3) mesophyll resistance. Actual values of the mesophyll resistance were calculated for several combinations of soil temperature and soil moisture stress. A distinct interaction between transpiration and soil moisture stress and soil temperature was indicated. An increasing degree of stomatal closure was observed at increasing soil moisture stress and decreasing soil temperature.
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