Effect of Different Combined Treatments on Tomato Seedling Growth in High-temperature Season.

The study on raising of strong tomato seedlings in high-temperature season is of great practical significance, because high-temperature condition in summer and autumn causes excessive growth of tomato seedlings easily. 'Fenniya' variety was selected as an experimental material, an orthogonal experiment was designed with rhizospheric temperature (A), light intensity (B) and nutrient salt concentration (C) as three factors which were designed with three levels, so as to study the effects of different treatments on root activity, strong seedling index, hypocotyl length and average internode length. The results showed that the most important factor for tomato seedling's root activity, hypocotyl length and internode length was nutrient salt concentration. In terms of effect on seedling index, substrate temperature should be reduced properly, to avoid excessive shading. It was primarily determined that the effects of three factors on the raising of strong tomato seedlings ranked as factor C, factor B and factor A from high to low; and the screened optimal seedling raising conditions were the rhizospheric temperature at (3 +1) °, the shading rate of (50 +5)% and the EC value of (5.0 +0.5) mS/cm. [ABSTRACT FROM AUTHOR]