Abstract: The goal was to study the growth of lettuce in different nutrient solutions and select the optimum nutrient solution which will be used in Inner Mongolia,with 1/4 Hogland and Arnon,Nutrient solution formula,Leaf vegetables of South China Agricultural University(B)as the three nutrient solution treatments were set using lettuce as material.The results showed that use of 1/4 Hogland and Arnon produced the greatest fresh weight of above ground,up to 47.35 g/plant,which was,respectively,10.3 g/plant higher than Nutrient solution formula and 11.3 g/plant higher than Leaf vegetables of South China Agricultural University(B).Relative Chlorophyll content using 1/4 Hogland and Arnon was 21.73,which was significantly 17.91 higher than the chlorophyll content using Leaf vegetables of South China Agricultural University(B).In alkaline conditions,Nutrient solution had the stable EC of 1/4 Hogland and Arnon,which was suitable for the growth of lettuce.Therefore,1/4 Hogland and Arnon is the most suitable nutrient solution for Inner Mongolia.The results provide a useful reference for the cultivation of leafy vegetables in nutrient solutions for the hard water areas of northern China.

Key words: Lettuce;Soilless culture;Nutrient solution