Possibility of High Soluble Solid Content Tomato Production under Water Stress Conditions Controlled by Matric Potential

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The present study was conducted to clarify the possibility of high soluble solid content tomato production in soilless culture with a small volume of substrate under water stress conditions, which was separate from salinity stress and controlled by matric potential for fertigation using a tensiometer. Treatments consisted of 2 set point levels of matric potential (-2 and -4 kPa) for fertigation in Experiment 1-1, 3 application rates (20, 80, and 180 mL/time/plant) in Experiment 1-2, and a combination of 2 set points of matric potential (-2 and -6 kPa) and 2 application rates (40 and 70 mL/time/plant) in Experiment 2. In Experiment 1, tomato plants and fruit production seemed to be affected by higher water stress treatment, but salinity stress was also applied simultaneously, in spite of leaching of salts into medium. In Experiment 2, it assumed that water stress treatment was mostly achieved by keeping the EC of medium solution below 5 dS・m^<-1>. The matric potential in the medium fluctuated -0.5 to 2 kPa at -2 kPa and -1 to -6 kPa at -6 kPa during the day. The proline content of leaves is considered an index of stress degree. It tended to increase with time during the experiment and to be higher at -6 kPa than -2 kPa treatment, although there seemed to be no distinct difference in the EC of medium solution among treatments. Therefore, according to the above proline content, it is suggested that water stress itself can stress the plant to some extent in soilless culture, but it may be difficult to induce sufficient stress intensity, which is comparable to the salinity stress producing high soluble solid content tomatoes, by water stress itself.
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Possibility of High Soluble Solid Content Tomato Production under Water Stress Conditions Controlled by Matric Potential

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