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Changes in Soil Microbial and Chemical Properties under Long‐term Crop Rotation and Fertilization
Author(s) -
Omay A. B.,
Rice C. W.,
Maddux L. D.,
Gordon W. B.
Publication year - 1997
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/sssaj1997.03615995006100060019x
Subject(s) - crop rotation , loam , agronomy , fertilizer , soil organic matter , crop residue , soil water , environmental science , organic fertilizer , soil texture , chemistry , crop , soil science , biology , agriculture , ecology
With renewed interest in maintaining our soil resources, it is important to establish criteria that can describe and quantify the effect of different crop management practices on soil organic matter (SOM). We conducted this study to assess changes in SOM and other soil properties after long‐term (>10 yr) continuous corn ( Zea mays L.; CC) and corn‐soybean rotation [ Glycine max (L.) Merr.; C/SB] with and without fertilizer. Soil samples were collected from two furrow‐irrigated CC and C/SB rotations on a Crete silt loam (fine, montmorillonitic, mesic Pachic Argiustoll) and a Eudora loam (coarse‐silty, mixed, mesic Fluventic Hapludoll). Long‐term (350‐d) laboratory incubation at optimum moisture and temperature conditions measured potentially mineralizable C (PMC) and N (PMN) as a measure of the active fraction of soil organic C and N. Microbial biomass C (MBC) and N (MBN), organic C and N, pH, and texture also were determined. Crop rotations that included high‐residue‐producing crops such as corn and addition of fertilizer increased soil organic C and N. Crop rotation did not affect PMC in the Crete soil, but addition of fertilizer significantly increased PMC by 32%. The PMN in both soils was not affected by crop rotation or fertilizer addition. Inclusion of soybean in the rotation decreased the stable and active fractions of organic C and N. Changes in soil organic C and N in response to crop rotation and fertilizer addition were related to the estimated amount of crop residues returned to the soil and to soil texture.