Abstract
Biogas slurry is a traditional high-quality organic liquid fertilizer. Three terrestrial plants with high economic value, fu gui cai, yang xin cai and strawberry, were selected for hydroponic cultivation using an optimal dilution of biogas slurry. The results of the experiments showed that strawberries could bloom and bear fruit and fu gui cai and yang xin cai grew well. However, in comparison with the control groups planted in soil, all three crops were subject to a certain degree of environmental stress, as shown by changes in growth, biomass indicators, physiological indicators and morphological indicators. The leaves and stems of yang cai and fu gui cai were tested for several types of heavy metals, and all met the requirements for human consumption. It is feasible to cultivate these three plants with biogas slurry. The results of this study can help guide hydroponic production practices and have practical significance and reference value.
Highlights
Biogas slurry is the residue from the anaerobic fermentation of livestock and poultry manure
Three terrestrial plants with high economic value, fu gui cai, yang xin cai and strawberry, were selected for hydroponic cultivation using an optimal dilution of biogas slurry
The leaves and stems of yang cai and fu gui cai were tested for several types of heavy metals, and all met the requirements for human consumption
Summary
Biogas slurry is the residue from the anaerobic fermentation of livestock and poultry manure. Among these uses, direct application in the field is the primary use of biogas slurry [8]. Studying the physiological response of economic crops to the biogas slurry hydroponic environment is important. The research literature on fu gui cai shows that this herb can be grown in a hydroponic environment, but there are no reports on the use of biogas slurry as a hydroponic nutrient solution for this herb. There are no reports about using biogas liquid as a hydroponic nutrient solution to cultivate yang xin cai. This study selected these three plants with high economic value for hydroponic experiments using diluted biogas as a nutrient solution. This study has reference significance for further research on new directions in biogas slurry utilization and the realization of facility-based agricultural production based on biogas slurry
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