Abstract: With the matierials of No.1 DongSheng tomato, studied the changing pattern of soil water status and morphological indexes under different(water elevation respectively is –3cm,0cm,3cm,and 6cm),the effects on the changing of photosynthetic rate,and some physiological indexes,like leaf water potential,sap leaf cell concentration, relative leaf water content and so on. The results showed that every water applying level can meet the needs of tomato,the changing pattern of soil water status are resemble.The plants under the treatment of 6cm growed well, the plants of 3cm and 0cm treatment a little worse than 6cm,-3cm treatment is the worst. The leaf transpiration speed, stomatal conductance of tomato under -3cm treatment is the smallest,but the WUE is the hightest. The leaf transpiration speed, stomatal conductance of tomato under 6cm treatment is the biggest, the WUE is lower.The results suggested,Partial rootzone non-pressure subirrigation greatly increased WUE of tomato and is worth promoting in the agricultural production.

Key words: non-pressure subirrigation, tomato, growth, physiological characteristics