Abstract: To investigate the influence of oxygen concentrations in the root system on tomato development in hydroponics cultivation,two tomato cultivars,which called Henan 4 and Fenzhenzhu,were grown in nutrient solution under four dissolve oxygen (DO) concentrations,which were hypoxia (0.5-2.0 mg/L; Nitrogen treatment),normoxia (7.0-8.0 mg/L; Air treatment),supersaturate oxygen (14.0-17.0 mg/L; Oxygen treatment) and no aeration as control (6.4-1.2 mg/L). Plant biomass,root vitality,photosynthetic pigment contents and growth indexes were investigated at seedling stage. The result showed that with the increase of oxygen concentration, the growth of seedlings was better, and the root vitality of seedlings increased, but photosynthetic pigment contents reduced. Compared with CK, normoxia and saturated oxygen treatment significantly increased the longest root length and the dry and fresh quality of tomato seedlings at the end of treatment. On the 18th day, for the Henan 4 which compared with CK, the total dry weight increased 24.00% and 74.86% under normoxia and saturated oxygen treatment, respectively. And the longest root length increased 67.23% and 230.55%, respectively. However, the total dry weight reduced 3.43%, and the longest root length reduced 1.63% under hpoxia treatment. The roots and shoots were more flourishing and biomass were the highest under saturated oxygen, thus improving the oxygen concentration in rhizosphere could be beneficial to the growth and yield of tomato.

Key words: Tomato seedlings, Rhizosphere oxygen concentration, Form growth, Oxgen Saturation, Hypoxia, Rootarchitecture

CLC Number: 

• S641.2