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Potential for a Rye Cover Crop to Reduce Nitrate Loss in Southwestern Minnesota

^a USDA-ARS Southeast Watershed Research Lab., Tifton, GA 31793-5737
^b Dep. of Biosystems and Agricultural Engineering, Univ. of Minnesota, St. Paul, MN 55108-6005
^c Southwestern Research and Outreach Center and Dep. of Soil, Water, and Climate, Univ. of Minnesota, Lamberton, MN 56152-1326
^d Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108-6026

View larger version (28K): [in a new window]   Fig. 1. Average monthly precipitation at Lamberton, MN, and Sioux Falls, IA.

View larger version (17K): [in a new window]   Fig. 2. Cumulative rye aboveground biomass (DM, dry matter) for four fall sowing dates; the data represent mean values after 2500 simulation years.

View larger version (22K): [in a new window]   Fig. 3. Predicted cumulative subsurface NO3–N losses for corn–soybean and corn–rye–soybean treatments for four fall rye sowing dates.

View larger version (17K): [in a new window]   Fig. 4. Reduction in subsurface drainage NO3–N losses for the corn–rye–soybean treatment compared with the corn–soybean treatment for four different planting dates.

View larger version (23K): [in a new window]   Fig. 5. Exceedance probability of the difference in subsurface drainage NO3–N losses between the corn–soybean and corn–rye–soybean treatments for four spring dates and four different fall sowing dates. The four curves in each graph display results for the four spring kill dates: 30 May, 15 May, 1 May, and 15 April (top to bottom).

View larger version (17K): [in a new window]   Fig. 6. Exceedance probability of the difference in subsurface drainage NO3–N losses between the corn–soybean and corn–rye–soybean treatments on 30 May given four different sowing dates. The four curves display results for the four sowing dates: 15 September and 1, 15, and 30 October (top to bottom).

View larger version (12K): [in a new window]   Fig. 7. Percentage of years having no NO3–N drainage losses through the spring date shown on the x axis, given a rye sowing date of 1 October. C-rye-sb = corn–rye–soybean; C-sb = corn–soybean.