Effects of Nitrogen Levels on Growth and Yield of Fruit in Greenhouse Tomato

Studied the changes of growth and fruit yield of different tomato varieties under 0、100、300、500 kg/hm2 four kinds of nitrogen levels.Under the 300 kg/hm2 nitrogen level,the tomato leaf mold disease incidence rate was lowest,the photosynthetic rate、stomatal conductance of tomato has reached the maximum,the fruit yield was also the highest;When the nitrogen increased,the nitrate concentrates on fruits had gradually advanced,and the ratio of soluble sugar had reduced.Jiafen 30 and Shengnv had the consistent response under different nitrogen conditions.