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Nitrogen in humic and fulvic acid fractions from a volcanic soil under pine: recovery efficiency of two extractants
Author(s) -
Certini Giacomo
Publication year - 2001
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/1522-2624(200106)164:3<267::aid-jpln267>3.0.co;2-x
Subject(s) - chemistry , humin , fulvic acid , sodium hydroxide , nitrogen , pyrophosphate , humic acid , organic matter , nuclear chemistry , environmental chemistry , organic chemistry , fertilizer , enzyme
The nitrogen content of humic and fulvic acid fractions recovered in parallel with sodium hydroxide and a mixture of sodium hydroxide and sodium pyrophosphate from a volcanic soil under pine was determined. Despite minor differences for some horizons, the values found by the two methods were similar. Furthermore, the ratio between the N contents in the humic and fulvic acid fractions (Nh : Nf) was independent of the nature of the extractant. This fact and the facility of the determination suggest investigating if the Nh: Nf ratio can be used as indicator for the quality of soil organic matter.