Physiological Effects of Drip Irrigation on Tea Tree

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Drought-resistant UPASI9 and drought-sensitive UPASI3 were used to study the effects of irrigation on the physiological and biochemical composition of tea plants. Drip irrigation (drip 2 times per week, 2mm each time) and no irrigation (control) were used in the experiment. The number of epicuticular waxes on UPASI9 leaves was more than UPASI3. The relative water content of the two varieties under irrigation conditions was significantly higher than that of non-irrigated tea plants. Drought stress had a significant effect on the relative water content of tea trees, which in turn affected the rate of photosynthetic carbon assimilation in tea plants. If the relative soil moisture content is not taken into consideration, UPASI3 absorbs and assimilate CO2 higher than UPASI9. Under the condition of drip irrigation, the chlorophyll fluorescence value of tea leaves was higher, and the photosynthetic chemical reaction of chlorophyll was affected by drought stress. Under drought conditions, the total chlorophyll content of tea leaves decreased significantly. Dark green leaves or UPASI9 tea leaves have a higher total chlorophyll content. The proline content of the control tea leaves accumulated, while the irrigation tea tree showed accumulation of root carbohydrates.