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Linking Wisconsin Dairy and Grain Farms via Manure Transfer for Corn Production

^a Dep. of Agronomy, Univ. of Wisconsin, 1575 Linden Dr., Madison, WI 53706
^b Massachusetts Association of Conservation Districts, 52 Boyden Rd., Holden, MA 01520
^c Michael Fields Agricultural Institute, W2493 County Rd. ES, East Troy, WI 53120
^d Agstat, 6394 Grandview Rd., Verona, WI 53593

View larger version (33K): [in this window] [in a new window]   Fig. 1. Presidedress soil nitrate test results (mg kg–1). Solid black line designates the level (10 mg kg–1) below which full rates of N fertilizer are recommended by UW Extension for corn. Dotted black line designates the level (21 mg kg–1) above which no further N fertilizer is recommended by UW Extension for corn (Bundy et al. 1994b). Bars represent standard error for comparison between treatments within a field-site. Asterisks indicate significance within a field-site (alpha = 0.05). FC = farmers' check (fertilizer-only), M = manure + supplemental fertilizer.

View larger version (45K): [in this window] [in a new window]   Fig. 2. Corn grain yield at 20 on-farm environments. Bars represent standard error for comparison between treatments within a field-site. Asterisks indicate significance within a field-site (alpha = 0.05). FC = farmers' check (fertilizer-only), M = manure + supplemental fertilizer.

View larger version (27K): [in this window] [in a new window]   Fig. 3. Postharvest nitrate levels at 19 on-farm environments: total from 0 to 91 cm. Bars represent standard error for comparison between treatments within a field-site. Asterisks indicate significance within a field-site (alpha = 0.05). FC = farmers' check (fertilizer-only), M = manure + supplemental fertilizer.