Effects of Biogas Slurry Irrigation on Growth,Photosynthesis, and Nutrient Status of Perilla frutescens Seedlings

Using biological decomposition of plants in an agroecology system is a good method to reduce biogas slurry pollutions. The effects of biogas slurry irrigation on the growth, photosynthesis, and nutrient status of Perilla frutescens seedlings were investigated. The results indicated that biogas slurry irrigation caused a marked increase in plant height, root length, biomass of shoot and root, photosynthetic pigment content, net photosynthetic rate, transpiration rate, stomatal conductance, intercellular carbon dioxide (CO₂) concentration, and water-use efficiency. Biogas slurry irrigation changed the concentration of nutrient elements of various organs.