Author:
CHADWICK D. R.,JOHN F.,PAIN B. F.,CHAMBERS B. J.,WILLIAMS J.
Abstract
Twenty slurries, 20 farmyard manures (FYM) and 10 poultry manures were chemically analysed to
characterize their nitrogen (N) fractions and to assess their potential organic N supply. The organic
N fraction varied between manure types and represented from 14% to 99% of the total N content.
The readily mineralizable N fraction, measured by refluxing with KCl, was largest in the pig FYMs
and broiler litters, but on average only represented 7–8% of the total N content. A pot experiment
was undertaken to measure N mineralization from the organic N fraction of 17 of these manures. The
ammonium-N content of the manures was removed and the remaining organic N mixed with a low
mineral N status sandy soil, which was sown with perennial ryegrass (Lolium perenne L.). N offtake
was used as a measure of mineralization throughout the 199 day experiment. The greatest N
mineralization was measured from a layer manure and a pig slurry, where N offtake represented 56%
and 37% of the organic N added, respectively. Lowest (%) N mineralization was measured from a
dairy cow slurry (< 2%) and a beef FYM (6%). The mineralization rate was negatively related to
the C[ratio ]organic N ratio of the ammonium-N stripped manures (P < 0·01, r = −0·63).
Publisher
Cambridge University Press (CUP)
Subject
Genetics,Agronomy and Crop Science,Animal Science and Zoology
Cited by
210 articles.
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