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ABSTRACT
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 CO2 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 KMnO4 solution. Pepsin digestion and C release during a short period of incubation appear to be useful single indexes.
1 Contribution from the Dep. of Soil & Environmental Sciences, Univ. of California, Riverside, CA 92521.
2 Former Graduate Student and Professor of Soil Science, respectively. The senior author is now a research soil scientist with the Instituto Nacional de Investigaciones Agricolas, Ap. Postal 247, Torreon, Coahuila, Mexico.
Received for publication August 4, 1980. Accepted for publication October 29, 1980.
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