Study on Suitable Water Resource Irrigation Rate of Tomato under Solar Greenhouse in Autumn

The shortage of water resources is increasing worldwide. For saving water resources, the study of horticultural plant water saving irrigation technology has greatly ecological and social significance. In this experiment, tomato was used as the test material with drip irrigation technology. Under same fertilizer rate, three levels of irrigation water were set: High irrigation Water (HW), Medium Irrigation Water (MW) and Low Irrigation Water (LW). The effects of different Irrigation levels on growth, yield, water use efficiency and soil nutrient content were investigated. The results show that the plant height and the accumulation of soil nutrients declined while the yield and water use efficiency increased with the decrease of irrigation rate. The average plant height of LW tomato was significantly lower than that of HW. Compared with HW, tomato yield and water use efficiency under LW increased by 6.6% and 65.4%, respectively, and the average irrigation rate decreased by 55.21%. The accumulation of N, P and K under LW in the 40~60cm soil layer was significantly lower than HW by 37.3%, 78.5% and 60.9%, respectively. LW has a positive effect on the increase of tomato yield and the reduction of nutrient leaching and accumulation.