Vertical and horizontal distribution characteristics of temperature and humidity and net photosynthetic rate of tomato in multi-span plastic greenhouse

In order to clarify how the physical properties of climatic factors change in the malti-span plastic greenhouse, a study was undertaken, the temperature and humidity of different height and horizontal was long-term measured. The result showed that the average temperature and humidity had obvious features in any weather condition. The value of photosynthesis rate of tomato is greatest at the top of hedge, with quickly decreasing at middle and lower part.