Relationship Between Growth of Tomato Planted in Spring and Temperature in Greenhouse and Temperature Regulation Control Measures in Langfang City

Using tomato variety "MEISHUAI" as test material, influencing factors of temperature in greenhouse for growing tomatoes planted in spring, relationship between tomato growth and temperature, and greenhouse management measures in Langfang City were studied． Results showed that there were highly significant correlation between daily average air temperature inside greenhouse and daily average 10 cm soil temperature, daily average photosynthetically active radiation and daily average air temperature outside greenhouse, with correlation coefficients were 0.693, 0.432 and 0.759（P＜0.01）, respectively． Stem diameter, plant height, horizontal and vertical diameter of fruit were significantly or extremely significantly positively correlated with accumulated temperature． In order to solve problem of over-high temperature in greenhouse, specific outdoor temperature control indicators and regulation control measures were proposed．