Mass Balances and Relationships between Carbon, Nitrogen and Phosphorous Pools in High Altitude Coarse Sandy Soils.
(S06-al-sheikh299343-poster)
Authors:
A. Al-Sheikh* - Colorado State Univ., Fort Collins, CO J.A. Delgado - USDA-ARS, Fort Collins, CO
K. Barbarick - Colorado State Univ., Fort Collins, CO R. Sparks - USDA-NRCS, Alamosa, CO
R. Bowman - USDA-ARS, Akron, CO M. Dillon - CSU-SLVRC, Center, CO
G. Cardon - Colorado State Univ., Fort Collins, CO Y. Qian - Colorado State Univ., Fort Collins, CO
Abstract:
We conducted studies to monitor the effect of cropping systems in C, N and P pools for rangeland and cultivated sites of South Central Colorado. The total amount of crop residue organic carbon (CROC) returned after two decades of cultivation was 15,741 kg C ha-1 for the potato:winter cover crop:potato (C1); 16,017 kg C ha-1 for potato:small grain (C2); 39,324 kg C ha-1 for the potato:small grain, all straw returned (C3); and 64,605 kg C ha-1 for the potato:small grain:small grain, all straw returned (C4). The Soil organic carbon (SOC) was 12,469, 8,267, 10,994, 12,183, and 14,560 kg C ha-1 for the range, C1, C2, C3 and C4, respectively. Total N was 1547, 1119, 1481, 1812, and 1902 kg N ha-1, for the range, C1, C2, C3 and C4, respectively. Total P was 52, 125, 81, 168, and 225 kg P ha-1 for the range, C1, C2, C3 and C4, respectively. Crop residue management has the potential to be used as a carbon sequestration tool for this region to increase SOC, protect soil quality and increase nutrient cycling.
Speaker Information: Abdullah Al-Sheikh, Colorado State Univ., Fort Collins, CO, Department of Soil and Crop Sciences Colorado St, Fort Collins, CO 80523; Phone: (970) 491-6517; E-mail:
Session Information: Tuesday, November 4, 2003, 9:00 AM-11:00 AM Presentation Start: 9:00 AM (Poster Board Number: 1632)
Keywords: carbon; nitrogen; phosphorous; sandy soils