Aiming at the difficulty in liquid digestate treatment in current biogas plants and the problem of excessive application of chemical fertilizers in modern agriculture,this study pretreated liquid digestate with different dilution proportions by microbial inoculants to obtain liquid fertilizers with different concentrations of liquid digestate explored.The effects of different concentrations of liquid digestate and its application methods(leaf spraying and watering)on the growth indexes,photosynthetic indexes and quality indexes of potted cabbage were explored.The results showed that:Low concentration of liquid digestate promoted the growth and development of Chinese cabbage by foliar spraying,and applying liquid digestate with a dilution of 15 to 20 times was the best.High concentration liquid digestate significantly improved the growth and quality indexes of Chinese cabbage,and the effect was better than that of chemical fertilizer treatment group.The optimal application plan was diluted by 1.5 times.Under the same nitrogen level,the effect of high concentration liquid digestate for irrigation on the growth and quality of Chinese cabbage was better than that of low concentration liquid digestate for foliar spraying.High concentration liquid digestate had the potential to replace chemical fertilizer,while low concentration liquid digestate could be used as a topdressing method to supplement nutrients.In conclusion,using liquid digestate pretreated by microbial agents as liquid fertilizer to cultivate Chinese cabbage can not only significantly improve its growth quality,but also reduce the application of chemical fertilizer.It has important practical significance for increasing crop income and protecting environment.
liquid digestateapplying methodChinese cabbagegrowth indexphotosynthetic indexquality index
国家科技期刊平台
NSTL
万方数据
