沼液沼渣替代化肥对轻度盐化潮土土壤性质及梨产量的影响OA北大核心

To investigate the effect of replacing chemical fertilizers with biogas slurry and residue on soil properties and pear yield in saline fluvo-aquic soil,a pear field experiment is conducted in a mildly saline fluvo-aquic soil.Five treatments are set up:no fertilization(CK),conventional fertilization(XG),biogas slurry and residue replacing NPK fertilizers(ZX,with substitution ratios of 25.00%,18.00%and 22.00%for N,P and K respectively),sole biogas slurry and residue(ZY)and optimized rapid-acting nitrogen fertilizers based on pear trees nutrient requirements(ZH).The results show that compared with conventional fertilization,the contents of soil alkali-hydrolytic nitrogen,available potassium and organic matter were significantly increased by 13.29%-26.24%,17.91%-34.49%and 18.16%-23.49%,respectively.ZH treatment is beneficial to enhance soil organic matter content and exhibit the best effect in improving both alkali-hydrolyzable N and available K concentrations.Compared with conventional fertilization,ZX,ZY and ZH treatments significantly decrease soil Cr contents by 30.00%,21.43%and 17.15%,respectively.ZX,ZY and ZH treatments significantly improve the contents of Cu and Fe in soil.Replacing fertilizer with biogas slurry and residue significantly increases soil alkaline phosphatase and sucrase activities by 8.82%-24.51%and 31.50%-76.60%,respectively.Compared with XG,ZX,ZY and ZH treatments significantly boost pear yield by 23.03%,14.89%and 14.25%,respectively.All three treatments enhance fruit Vc content,among which ZX treatment achieves the optimal results.Comprehensive analysis reveal that replacing fertilizer with biogas slurry and residue at different proportions can significantly improve soil properties,increase pear yield and quality,with ZX exhibiting the best overall effect.The research results provide theoretical reference for the application of biogas slurry and residue in mildly saline fluvo-aquic soils.