沼渣添加对黄瓜育苗基质性能的影响OA

In response double challenges of excessive consumption for peat and biogas residue disposal,applying biogas residue as a partial substitute for peat to cucumber seedling substrates was investigated in this study,which providing practi-cal guidance for efficient resource utilization of biogas residue;As the test material,cattle manure biogas residue was mixed with peat,vermiculite,and perlite at specific volume ratios,and the feasibility of using biogas residue as a substitute for peat in cucumber seedling substrate was explored:1)the addition of biogas residue caused a rapid increase in bulk densi-ty,pH,and EC of the cucumber seedling substrate as the proportion increased,while the total porosity showed a slow de-crease.When the addition proportion for biogas residue reached a specific value,all indicators approached or exceeded the recommended limit standard,which inhibiting the growth of cucumber seedlings.2)Seedling growth indicators,including plant height,stem diameter,fresh weight,and dry weight,demonstrated that the T,and T2 treatments outperformed the CK.Comparisons of emergence rate and seedling strength index revealed that all treatments,except T5,were superior to the CK,indicating that an appropriate amount of biogas residue can enhance cucumber emergence and seedling vigor.3)Using binary regression analysis,the optimal substitution ratio of biogas residue for key individual indicators of cucumber seedling substrate ranged from 10％～24％.A comprehensive evaluation suggested that the suitable substitution ratio lies between 17.44％～21.32％;Partial substitution of peat with biogas residue in seedling substrates promotes cucumber seedling growth,with the optimal addition ratio of biogas residue being approximately 20％.