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Evaluation of Nitrate-Nitrogen Transport in a Potato–Barley Rotation

^a USDA-ARS, Soil Plant Nutrient Research Unit, Fort Collins, CO 80522
^b USDA-NRCS, Canyon City, CO 81212
^c USDA-NRCS, Alamosa, CO 81101
^d Colorado State Univ., SLVRC, Center, CO 81125
^e Usda-Nrcs, San Luis, Co 81152
^f Colorado Dep. of Public Health and Environment, Denver, CO 80246

View larger version (25K): [in a new window]   Fig. 1. Observed and NLEAP-predicted available soil water in the root zone at harvest for potato (P) and barley (B) grown in the San Luis Valley. Regression line for the barley growing period (Line B) is y = -0.44 + 1.3x (r2 = 0.81, significant at P < 0.05). The potato growing period has an equation as follows (Line P): y = -0.20 + 1.2x (r2 = 0.93, significant at P < 0.01). The regression equation for the whole data set P and B (line not shown) is y = -0.27 + 1.2x (r2 = 0.82, significant at P < 0.01)

View larger version (27K): [in a new window]   Fig. 2. Observed and NLEAP-predicted residual soil NO-3–N (RSN) in the root zone of potato (P) and barley (B) grown in the San Luis Valley. Regression line for the barley growing period (Line B) is y = 6.19 + 0.72x (r2 = 0.70, significant at P < 0.01). The potato growing period has an equation as follows (Line P): y = 8.49 + 0.82x (r2 = 0.43, significant at P < 0.05). The regression equation for the whole data set P and B (line not shown) is y = 4.7 + 0.86x (r2 = 0.71, significant at P < 0.001)

View larger version (26K): [in a new window]   Fig. 3. Observed and NLEAP-predicted residual soil NO-3–N (RSN) in the bottom of the root depth to 0.9 m soil depth of potato (P) and barley (B) grown in the San Luis Valley. Regression line for the barley growing period (Line B) is y = 7.15 + 0.98x (r2 = 0.39, significant at P < 0.13). The potato growing period has an equation as follows (Line P): y = 33.15 + 0.73x (r2 = 0.56, significant at P < 0.01). The regression equation for the whole data set P and B (line not shown) is y = 12.5 + 0.95x (r2 = 0.78, significant at P < 0.001)

View larger version (26K): [in a new window]   Fig. 4. Observed and NLEAP-predicted residual soil NO-3–N (RSN) in the 0- to 0.9-m soil depth profile of potato (P) and barley (B) grown in the San Luis Valley. Regression line for the barley growing period (Line B) is y = 9.55 + 0.94x (r2 = 0.75, significant at P < 0.01). The potato growing period has an equation as follows (Line P): y = 53.8 + 0.70x (r2 = 0.79, significant at P < 0.01). The regression equation for the whole data set P and B (line not shown) is y = 17.7 + 0.90x (r2 = 0.90, significant at P < 0.001)