Comparative Study on Planting Patterns of Different Leaf Vegetable in Summer

In view of effect of high temperature in summer on growth of leafy vegetables in solar greenhouse，a comparative experiment was conducted among three oversummer planting patterns：soil+shading net，matrix+shading net and matrix+shading net+wet curtain.Effects on temperature and humidity of greenhouse，growth of leafy vegetables and economic benefits were analyzed.Preliminary results showed that on hottest day of year，average outdoor daytime（8：00am～15：30pm）temperature was 32.5 ℃.Average daytime temperature of soil+shading net，matrix+shading net planting mode was 7.1 and 6.4 ℃ higher than that of matrix+shading net+wet curtain planting mode，respectively.Meanwhile，average relative humidity of the indoor daytime was lower than that of the soil+shade，and average relative humidity of the substrate+wet curtain was the highest.According to yield and benefit，yield of Brassica pekinensis and Brassica japonica Sieb was the highest under mode of matrix+sunshade+wet curtain mode，the highest yield of rapeseed planted was under matrix+sunshade mode.Three kinds of leaf vegetables were the best planting efficiency under substrate+shade+wet curtain planting.