About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in JEQ

  1. Vol. 7 No. 2, p. 196-202
     
    Received: June 15, 1977


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/jeq1978.00472425000700020009x

Nitrification and Denitrification in Cattle Manure-Amended Soil1

  1. W. D. Guenzi2,
  2. W. E. Beard3,
  3. F. S. Watanabe2,
  4. S. R. Olsen2 and
  5. L. K. Porter2

Abstract

Abstract

Dry cattle manure was mixed with soil at a rate of 45 and 90 metric tons/ha and amended with K15NO3, and (15NH4)2SO4 in separate treatments. The greenhouse experiment included an uncropped and a sorghum (Sorghum vulgure Pers.) treatment. Soil atmosphere was analyzed for CO2, N2, O2 + Ar, N2O, and enriched 15N2. The energy-rich manure created a high biological oxygen demand and caused low O2 and high CO2 concentrations in the soil environment. Evidence for denitrification was obtained by the presence of N2O and 15N enriched N2-in the soil gases for the manure treatments amended with 15NO3 and 15NH4+. The 15N enriched N2 in the soil gases in the uncropped soil decreased to background levels after 10 days in the NO3-amended manured soils, whereas 15N2 enrichment from 15NH4+-amended manured soils existed at 39 days. The recovery of NO3-15N in the uncropped soils was 90.2% without manure, 9.4% with 45, and 8.1% with 90 metric tons/ha of manure. Recovery of NH4+-15N in the uncropped soil was 92.2% without manure, 60.3% with 45, and 57.0% with 90 metric tons/ha of manure. Higher concentrations of added fertilizer N were recovered in the cropped system. In this study, where manure was mixed thoroughly with soil, water was added daily to field capacity, and O2 concentrations were never below 3.1%, denitrification must have occurred in anaerobic microsites in a predominantly aerobic system. The results for the NH4+-manure treatment demonstrated that both nitrification and denitrification occurred simultaneously.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .