Research on the relationship among the growth period environmental factors of tomato under the condition of mulched drip irrigation in greenhouse

The air temperature and humidity in greenhouse and the Photosynthetic active radiation are important factors to affect the growth of crops. To study the relationship between them has direct guiding significance to the greenhouse management. We test and analysis the environmental factors affecting crop growth such as the air temperature and humidity in greenhouse, soil temperature and humidity, leaf temperature, leaf transpiration rate and photosynthetic active radiation with tomato of drip irrigation under mulch film as the experimental material. The results showed that the relationship between the daily average soil temperature and air temperature is very good and the square of the correlation coefficient is above 0.73. There is a significant correlation between the inside and outside the plastic film of photosynthetic active radiation. When the photosynthetic active radiation intensity is within the range of 0-400w/m
²
, the temperature in greenhouse is linearly related to the photosynthetic efficiency. The stratified soil water content in the plastic film is more than that outside the plastic film. The soil water content of 0-20cm and 20-40cm is more obvious between inside and outside the plastic film. The soil water content (40-100cm) of the difference percentage between inside and outside the plastic film is within 2.1%.