Chemical changes in soils fertilized with ammoniacal N which may contribute to grass tetany

Karlen, D.L.; Whitney, D.A.; Ellis, R.J.

Transactions of the Kansas Academy of Science 81(1): 311-317


ISSN/ISBN: 0022-8443
DOI: 10.2307/3627382
Accession: 000613368

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In laboratory trials using Eudora loam and Bates sandy loam soils, following nitrification of an ammoniacal source of N there was shown to be a differential loss of exchangeable cations. It is suggested that this differential loss of exchangeable cations might be a factor contributing to lowered forage Ca and Mg conc. and increased K:(Ca + Mg) equivalent ratios. These changes have been associated with increases in grass tetany and may partially explain outbreaks of grass tetany in cattle grazing forages fertilized with ammonium N.