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Mineralization of Manure Nitrogen—Correlation with Laboratory Indexes
Author(s) -
Castellanos J. Z.,
Pratt P. F.
Publication year - 1981
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1981.03615995004500020025x
Subject(s) - incubation , pepsin , chemistry , zoology , nitrogen , manure , incubation period , mineralization (soil science) , digestion (alchemy) , chromatography , agronomy , biology , biochemistry , enzyme , organic chemistry
Simple and multiple correlations between available N estimated from a 10‐month greenhouse trial with 10 manures and a number of potential laboratory indexes to available N are presented. The best single chemical index to available N was the N extracted by digestion with pepsin. Slightly more than 80% of the variation in available N was related to variations in pepsin N. High correlations were found between available N and the C released as CO 2 during incubations of 1, 2, and 4 weeks. In a multiple correlation using all chemical indexes plus N and C released in 1‐week incubations, the significant indexes were N released by incubation, C released during incubation and the C/N ratio. In a multiple correlation with all indexes, the significant factors were N released in 1‐ and 10‐week incubations, the C/N ratio, and N released to acid KMnO 4 solution. Pepsin digestion and C release during a short period of incubation appear to be useful single indexes.