Effects of biochar replacement in peat on growth and nutritional quality of lettuce
This study investigates the feasibility of replacing biochar in peat for soilless cultivation of lettuce.A mixed substrate of peat,perlite and vermiculite was used as the control,compared with 5%,10%,15%and 20%of peat replaced with biochar to analyze the changes in growth and nutritional quality indexes of lettuce,and their correlation with substrate properties.The bulk density(BD)and alkaline nitrogen(AN)content decreased significantly,and the total porosity,aeration porosity,available phosphorus(AP),available potassium(AK),microbial biomass(MBC,MBN)and enzyme activity increased significantly with biochar replaced peat.The growth of lettuce was better than the control,with the dry mass of shoot and root increasing by 29.31%-67.24%and 50.00%-158.33%,respectively.At the same time,the root activity,chlorophyll,soluble sugar,soluble protein and Vitamin C content of lettuce of each treatment were significantly higher than the control.RDA results showed that BD,aeration porosity,AN,AP,and AK of the substrate were the main physicochemical properties factors affecting the growth and nutritional quality of lettuce,while MBC,sucrase activity,urease activity,and MBN were the main microbial properties factors affecting the growth and nutritional quality of lettuce.Replacing 5%to 20%of peat in lettuce culture medium with biochar is feasible.Biochar can promote the growth and nutritional quality of lettuce by improving the porosity of the substrate,nutrient cycling enzyme activity,and the content of effective nutrients.
国家科技期刊平台
NSTL
万方数据
维普
