Effect of meteorological conditions in self-controlled greenhouse on the yield of tomato

The environment conditions and managements of fertilizer and water in Holland greenhouse which was recommended by Shanghai were controlled by computer.Based on two years' yield data of tomato and meteorological conditions,the relevant analysis was done.The results showed that the main factors influencing the tomato yield are irradiation,temperature difference and relative humidity under Shanghai weather conditions. It will help to improve modulation measures.