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United States Department of Agriculture

Agricultural Research Service

Title: TILLAGE, COVER CROP, AND NITROGEN FERTILIZER SOURCE EFFECTS ON SOIL CARBON AND NITROGEN SEQUESTRATION.)

Author
item Sainju, Upendra
item Senwo, Zacahry
item Nyakatawa, Ermson
item Tazisong, Irenus
item Reddy, K. chandra

Submitted to: Symposium Proceedings
Publication Type: Abstract only
Publication Acceptance Date: 5/5/2007
Publication Date: 7/15/2007
Citation: Sainju, U.M., Senwo, Z.N., Nyakatawa, E.Z., Tazisong, I.A., Reddy, K. 2007. Tillage, cover crop, and nitrogen fertilizer source effects on soil carbon and nitrogen sequestration. In: A. Chabbi (ed.) Proc. International Symposium on Organic Matter Dynamics in Agro-Ecosystems. July 16-19, 2007. Poitiers, France. p. 446-447.

Interpretive Summary:

Technical Abstract: The 10-yr effect of combinations of tillage (no-till, mulch till, and conventional till), cover crop (rye vs. none), and N fertilization source and rate (0 and 100 kg N ha-1 from NH4NO3 and 100 and 200 kg N ha-1 from poultry manure) was evaluated on crop residues and soil organic C (SOC) and organic N (SON) contents at the 0-20 cm depth in northern Alabama, USA The amount of crop residue returned to the soil increased with N fertilization from NH4NO3 and poultry manure, regardless of tillage or cover crop. While SOC and SON were not influenced by treatments at 10-20 cm, they were 12 to 21% greater in rye and N fertilization with or without tillage than in no rye and N fertilization with conventional tillage at 0-10 cm. To a depth of 20 cm, SOC and SON contents were 23-25% greater with cropping than with bare fallow and 8-19% greater with poultry manure than with 0 and 100 kg N ha-1 from NH4NO3. While tillage had minimum impact, long-term N fertilization from inorganic N fertilizer or poultry manure with rye cover cropping increased C and N sequestration, indicating improved soil quality and productivity.

Last Modified: 8/24/2016
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