Soil organic matter as a function of nitrogen fertilization in crop successions
DOI:
https://doi.org/10.1590/S0103-90162005000400011Keywords:
humic acids, humin, urea, corn, soybeanAbstract
The interdependence between the C and N cycles is reflected by the levels of soil organic matter (SOM). SOM and organic C levels in water soluble (C-WS) humic acids (C-HA), fulvic acids (C-FA), and humin fractions (C-H) were evaluated through the classic chemical fractionation method in samples of a Rhodic Eutrudox from a randomized blocks experimental design, with split-split-plots using five nitrogen sidedressing levels for corn (0; 60; 120; 180; and 240 kg ha-1 N) as the main treatment, two crop sequences (corn-corn and soybean-corn) as the secondary treatment, and two sampling depths (0 to 0.2 and 0.2 to 0.4 m) as a sub-subtreatment. Nitrogen fertilization did not affect SOM levels, but favored the synthesis of substances in the C-HA fraction. There was a quadratic effect of N rates on the C-WS and C-FA levels in the corn-corn succession. The soybean-corn succession resulted in larger SOM and organic C levels in the C-H fraction.Downloads
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Published
2005-08-01
Issue
Section
Soils and Plant Nutrition
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All content of the journal, except where identified, is licensed under a Creative Common attribution-type BY-NC.How to Cite
Soil organic matter as a function of nitrogen fertilization in crop successions . (2005). Scientia Agricola, 62(4), 374-380. https://doi.org/10.1590/S0103-90162005000400011