The formation of acidic subsurface layers in soil under stock urine patches with special emphasis on nitrogen transformations

Research output: ThesisDoctoral Thesis

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Abstract

The cause of the formation of acidic subsurface layers in urine patches was examined.The rate and magnitude of N processes occurring under simulated urine patches in column studies in the glasshouse and laboratory were examined in 2 cm depth increments and related to the observed changes in soil pH. A H+ balance model was used to determine the magnitude of the soil pH change attributed to the N processes of urea hydrolysis, NH3 volatilisation, nitrification, and net mineralisation/ immobilisation in a soil column study in the absence of plants. The influence of plant growth on soil pH change after application of simulated urine was investigated in a soil column system. The effect of varying concentrations of simulated urine constituents (urea-N and KCl) on soil pH after application to soil under actively growing plants was also determined. A field study was conducted to substantiate the formation of acidic subsurface layers in a ryegrass pasture during two varying environmental seasons. Acidic subsurface layers were produced in both spring and summer as a result of N transformations occurring after the application of simulated urine solutions.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Charles Sturt University
Supervisors/Advisors
  • Black, Scott, Principal Supervisor
  • Conyers, Mark, Co-Supervisor
Award date01 Mar 2002
Place of PublicationAustralia
Publisher
Publication statusPublished - 2002

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