Mixed Application of Dairy Farm Wastewater and Organic Fertilizer on the Physical and Chemical Soil Properties
In order to investigate the impact of mixed application of dairy farm wastewater and organic fertilizer on soil physical and chemical fertility,this study conducted pot experiments with Chinese cabbages using a"Latin Square"design,irrigating them with equal ratios of both inputs in the soil of Hashatu ranch of Yili Company in Hohhot.The soil physical fertilities(soil water con-tent,field water capacity,and soil bulk density)as well as soil chemical fertilities(soil organic mat-ter,soil available phosphorus,and soil available nitrogen)were assessed.Through factorial analysis and grey relational analysis,the study systematically examined the combined influence of dairy farm wastewater and organic fertilizer on soil fertility before determining the optimal application rate for enhancing soil fertility.The results showed that:(1)Factorial analysis indicated that the application of dairy farm wastewater significantly influenced soil physical fertility(greatest was 400 g).Addi-tionally,organic fertilizer had a pronounced effect on soil chemical fertility(greatest was 240 g).Moreover,the combined application of dairy farm wastewater and organic fertilizer exhibited syner-gistic effects on both soil physical and chemical fertility,with optimal dosages identified as 400 g for dairy farm wastewater and 240 g for organic fertilizer.(2)The application of organic fertilizer and dairy farm wastewater had a significant effect on soil stoichiometric ratio,with organic fertilizer hav-ing the greatest effect followed by dairy farm wastewater+organic fertilizer and dairy farm wastewater.Organic fertilizer exerted a substantial influence on soil C/N and C/P ratios,while dairy farm wastewater significantly affected soil N/P ratio.(3)The effluent of oxidation pond and organic fertilizer had an effect on the comprehensive fertility of soil.Grey relational analysis revealed that the optimal application rates were 400 g for dairy farm wastewater and 240 g for organic fertilizer.Both individual and combined applications of these amendments influenced physical and chemical soil fertility,stoichiometric ratios,and overall fertility.Notably,the combined application of dairy farm wastewater and organic fertilizer exhibited a more pronounced effect on soil fertility.
dairy farm wastewaterorganic fertilizerfactorial analysisgrey relational analy-sisphysical and chemical soil properties
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