Effects of Vermicompost and Maize Roots on the Leaching of Ammonium Nitrogen in Saline Soil
LU Yuchen
WANG Chong
LIU Mengli
Abstract：To investigate the changes in leaching characteristics of exogenous ammonium nitrogen fertilizers in saline-alkali soil due to earthworm castings and corn cultivation,a 15N isotope tracing experiment was conducted using soil column simula-tions.Four treatments were established,including a blank control group,earthworm casting addition group,corn cultivation group,and earthworm casting addition + corn cultivation group.The research findings indicate that,within the 0～30 cm soil layer,earthworm castings and corn cultivation significantly reduce the leaching of ammonium nitrogen fertilizers in saline-alkali soil.The addition of earthworm castings mitigates the downward leaching of exogenous nitrogen fertilizers caused by corn cultivation,improving the soil's capacity to retain ammonium nitrogen fertilizers.Corn cultivation,through the ac-tion of plant roots,inhibits the rate of soil nitrification,decreasing the conversion of ammonium nitrogen fertilizers and en-hancing the retention of ammonium nitrogen fertilizers in shallow soil(10～20 cm)in saline-alkali soil,which enhances the long-term effectiveness of exogenous nitrogen fertilizers.The results of this study provide theoretical support for reducing ni-trogen leaching losses in saline-alkali soils.
Keywords：15N isotope tracer techniqueammonium nitrogen fertilizersoil column experiment
Publication Date：2023-11-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 130-134 )