Effect of Temperature on Expansion of Tomato Leaf Area in Greenhouse

The effect of temperature on expansion of tomato leaf area in greenhouse was studied.The coefficient of leaf area R was determined by measureing sample.When leaf length was less than or equal to 20 cm,R was equal to 0.378 2.When leaf length was larger than 20 cm,R was equal to 0.318 4.The determination coefficient of simulated and observed was 0.950 2.The results of experiment showed that the extended speed of growth prophase and growth anaphase of tomato leaf was slower than the extended speed of growth metaphase.When temperature was increment or decrease,the extended quantity of leaf area and leaf area of mature leaf also increased or decreased.The effect of temperature changing on expanded quantity of leaf area was lately showed.Low temperature may decrease the dry matter content of tomato leaf in winter.