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United States Department of Agriculture

Agricultural Research Service

Title: Effects of Tillage, Residue and Nitrogen Fertilization on C and Natural Abundance C-13

item Layese, Milegua - UNIVERSITY OF MINNESOTA
item Clapp, Charles
item Allmaras, Raymond
item Linden, Dennis
item Dowdy, Robert

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 19, 1998
Publication Date: N/A

Technical Abstract: Soil samples from a long-term experiment on tillage, residue and nitrogen management under continuous corn from selected years were analyzed for C and **13C. Carbon contents in tilled plots decreased slightly with years of cropping. Amounts of C in no-till plots with residues removed remained about the same with years of cropping, while those with residues returned increased markedly. The delta**13C values increased steadily with years of cropping in all treatments; the no-till with residues returned having the highest increase. Nitrogen effects on C and **13C seemed to be evident only with no-till plots with residues returned. The delta**13C values increased with depth in both tilled and no-till plots. In the 15- to 30-cm depths, carbon contents decreased and delta**13C values increased with years of cropping under no-till, especially with residues removed. There was no consistent trend in C contents and delta**13C values in the 15- to 30-cm depths in tilled plots with years of cropping.

Last Modified: 4/22/2015