Study on the Photosynthetic Characteristics of Tomato in Greenhouse under Different Irrigation Schedule

Photosynthesis has direct and significant effect on the growth and development of crop,and it is also the base of high yield.Therefore,it is significant to study the physiological change under different irrigation schedule to promote tomato production in the greenhouse.Through comparison between drip irrigation and traditional irrigation,the influence of drip irrigation schedule on physiological features and water using efficiency is studied.The results indicate that under the condition of drip irrigation,the peak of photosynthesis appears ahead,and the water utilizing rate of plants is improved;the stomatal conductance of tomato has significant correlation with net photosynthetic rate,transpiration and water utilizing rate;we can shorten the irrigation intervals while the irrigation amount is low to improve the water utilizing rate.