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Long-Term Effects of Sustained Beef Feedlot Manure Application on Soil Nutrients, Corn Silage Yield, and Nutrient Uptake

^a Department of Agronomy and Horticulture, University of Nebraska, 377 Plant Science, Lincoln, NE 68583
^b USDA-ARS, U.S. Meat Animal Research Center, Clay Center, NE 68933

View larger version (29K): [in a new window]   Fig. 1. Annual manure application rates (bars) and NCK treatment fertilizer application rate (diamond). CN, composted manure application rate to supply crop nitrogen requirement; CP, composted manure application rate to supply crop phosphorus removal; MN, manure application rate to supply crop nitrogen requirement; MP, manure application rate to supply crop phosphorus removal; NCK, inorganic nitrogen fertilizer check.

View larger version (70K): [in a new window]   Fig. 2. Silage dry matter yield as influenced by manure treatment. Error bars that do not overlap indicate treatment means that are significantly different at a probability level of 0.05. CN, composted manure application rate to supply crop nitrogen requirement; CP, composted manure application rate to supply crop phosphorus removal; MN, manure application rate to supply crop nitrogen requirement; MP, manure application rate to supply crop phosphorus removal; NCK, inorganic nitrogen fertilizer check.

View larger version (64K): [in a new window]   Fig. 3. Silage N uptake as influenced by manure treatment. Error bars that do not overlap indicate treatment means that are significantly different at a probability level of 0.05. CN, composted manure application rate to supply crop nitrogen requirement; CP, composted manure application rate to supply crop phosphorus removal; MN, manure application rate to supply crop nitrogen requirement; MP, manure application rate to supply crop phosphorus removal; NCK, inorganic nitrogen fertilizer check.

View larger version (72K): [in a new window]   Fig. 4. Silage P uptake as influenced by manure treatment. Error bars that do not overlap indicate treatment means that are significantly different at a probability level of 0.05. CN, composted manure application rate to supply crop nitrogen requirement; CP, composted manure application rate to supply crop phosphorus removal; MN, manure application rate to supply crop nitrogen requirement; MP, manure application rate to supply crop phosphorus removal; NCK, inorganic nitrogen fertilizer check.

View larger version (47K): [in a new window]   Fig. 5. Silage dry matter yield as influenced by cover crop treatment. Error bars that do not overlap indicate treatment means that are significantly different at a probability level of 0.05.

View larger version (39K): [in a new window]   Fig. 6. Soil residual NO3–N as influenced by manure treatment. CN, composted manure application rate to supply crop nitrogen requirement; CP, composted manure application rate to supply crop phosphorus removal; MN, manure application rate to supply crop nitrogen requirement; MP, manure application rate to supply crop phosphorus removal; NCK, inorganic nitrogen fertilizer check.

View larger version (18K): [in a new window]   Fig. 7. Soil residual NO3–N as influenced by cover crop, mean of MN and CN treatments. Error bars indicate means that are significantly different at a probability level of 0.05. CN, composted manure application rate to supply crop nitrogen requirement; MN, manure application rate to supply crop nitrogen requirement.

View larger version (19K): [in a new window]   Fig. 8. Soil Bray-1 P as influenced by manure treatment. Error bars that do not overlap indicate treatment means that are significantly different at a probability level of 0.05. CN, composted manure application rate to supply crop nitrogen requirement; CP, composted manure application rate to supply crop phosphorus removal; MN, manure application rate to supply crop nitrogen requirement; MP, manure application rate to supply crop phosphorus removal; NCK, inorganic nitrogen fertilizer check.

View larger version (26K): [in a new window]   Fig. 9. Soil Bray-1 P as influenced by manure treatment, 0- to 0.15-m depth increment. Error bars that do not overlap indicate treatment means that are significantly different at a probability level of 0.05. CN, composted manure application rate to supply crop nitrogen requirement; CP, composted manure application rate to supply crop phosphorus removal; MN, manure application rate to supply crop nitrogen requirement; MP, manure application rate to supply crop phosphorus removal; NCK, inorganic nitrogen fertilizer check.