Research On High Efficient Water Use Mechanism And Irrigation Model Of Mini-Watermelon In Greenhouse

Mini-watermelon,as a new varieties of watermelon, has become a high-grade and active demand fruit in China's watermelon market. Moreover, it is one of the most planted and benefit obtained fruits in the greenhouse. Using advanced irrigation technique and suitable irrigation model to irrigate plants according to the requirements are very important in improving yield and quality of watermelon and saving water. For this we carried out experiment on physiological ecology indexes and water consumption rules of watermelon during its growing periods. We studied the problems on efficient water use and irrigation model of greenhouse watermelon by experiment method and theoretic analysis. The main results show as follows:(1) The serious water deficit in seeding stage , blossoming and bearing fruits stage were seriously inhibited the growth of mini-watermelon main vine, and the degree of water deficit increased, the main vine growed slowly. The moderate water deficit in seeding stage was propitious to plant growth, and the mini-watermelon main vines had water compensation effect, but the serious water deficit in fruit spreading stage and fruit maturing stage had little influence on the main vine growth. The moderate water deficit caused favorable influence to leaf area index (LAI) in seeding stage, but the serious water deficit caused unfavorable influence and decreased water compensation effect to the main vine growth.(2)The diurnal change on leaf cell sap concentration (CSC) was a typical unmoral curve, but the net photosynthetic rate (Pn) and stomatal conductance were both typical bimodal curve. The content of chlorophyll a, chlorophyll b and chlorophyll (a+b) of T11 treatment was the highest, T14 treatment was the lowest, but the chlorophyll (a/b) of T14 treatment was the highest, T11 treatment was the lowest in seeding stage. The content of chlorophyll a and chlorophyll (a+b) displayed a trade of T1