Effects of Long-term Manure Fertilizer on Saline-sodic Properties and Stoichiometric Ratio of Saline-sodic Soil in Songnen Plain
Saline-sodic soil has a high degree of salinization and poor nutrient availability,the application of organic fertilizer can promote soil salt leach,reduce the degree of soil salinization,and increase the nutrient content and the supply capacity of soil carbon,nitrogen and phosphorus.According to the years of applying cattle manure in the soil,4 treatments were conducted with different application years of cattle manure for 21(Y21),18(Y18),15(Y15)and no application of cattle manure(CK).Soil samples in each treatment were collected from 0 to 20 and 20 to 40 cm soil layers to explore the soil saline properties and nutrient content.The results showed that soil organic carbon(SOC),total-N(TN)and total-P(TP)contents of Y21,Y18,Y15 treatments were significantly increased than CK,but soil water-soluble salt ions,pH,electrical conductance(EC),sodium adsorption ratio(SAR)and exchangeable sodium percentage(ESP)were significantly decreased compared to CK at both 0 to 20 and 20 to 40 cm soil layers.At 0 to 20 and 20 to 40 cm soil layers,carbon nitrogen ratios(C/N)of Y21,Y18,Y15 treatments significantly reduced compared to CK.At 0 to 20 cm soil layer,nitrogen phosphorus ratios(N/P)of Y21,Y15 treatments significantly increased from 0.95 to 1.84 and 2.11.At the 20 to 40 cm soil layers,N/P of Y21,Y15 treatments significantly increased from 1.15 to 2.25 and 2.44.The carbon phosphorus ratio(C/P)of each treatment had no similar regularization compared to CK at 0 to 20 cm soil layer and no significant difference was observed at 20 to 40 cm soil layer.The multivariable linear regression model showed that C/N was affected by SOC,TN,and ESP,while N/P and C/P were mainly regulated by TP and TN.In conclusion,the long-term application of manure fertilizer could reduce the degree of soil salinity and C/N,increase the contents of SOC,TN,TP and N/P.The nutrient supply of soil reached its maximum at 15 years of manure fertilizer application.
solonetzcomposted cattle manureexchangeable sodium percentageecological stoichiometric ratio
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