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Effects of Overseeding Cool-Season Annuals on Hay Yield and Nitrogen and Phosphorus Uptake by Tifton 44 Bermudagrass Fertilized with Swine Effluent

USDA–ARS, Crop Sci. Res. Lab., Waste Management and Forage Res. Unit, P.O. Box 5367, Mississippi State, MS 39762

View larger version (26K): [in a new window]   Fig. 1. Actual and 30-yr mean monthly precipitation during the course of the experiment. Data were recorded by the National Weather Service in the vicinity of the experimental plots.

View larger version (24K): [in a new window]   Fig. 2. Dates of five annual harvests of Tifton 44 bermudagrass plots with combinations of 1 to 2 and 3 to 5 used in spring vs. summer comparisons.

View larger version (17K): [in a new window]   Fig. 3. Cumulative dry matter (DM) yield for each of five winter annual overseeding treatments through five harvests annually in Tifton 44 bermudagrass plots.

View larger version (29K): [in a new window]   Fig. 4. Cumulative forage dry matter (DM) yields from two spring and three summer harvests in each of 3 yr for Tifton 44 bermudagrass plots following fall overseeding with winter annuals in a field fertilized with swine lagoon effluent.

View larger version (20K): [in a new window]   Fig. 5. Cumulative N uptake for each of five winter annual overseeding treatments through five harvests annually in Tifton 44 bermudagrass plots (ns = not significant in ANOVA F test).

View larger version (29K): [in a new window]   Fig. 6. Cumulative forage N uptake from two spring and three summer harvests in each of 3 yr for Tifton 44 bermudagrass plots following fall overseeding with winter annuals in a field fertilized with swine lagoon effluent (ns = not significant in ANOVA F test).

View larger version (20K): [in a new window]   Fig. 7. Cumulative P uptake for each of five winter annual overseeding treatments through five harvests annually in Tifton 44 bermudagrass plots.

View larger version (30K): [in a new window]   Fig. 8. Cumulative forage P uptake from two spring and three summer harvests in each of 3 yr for Tifton 44 bermudagrass plots following fall overseeding with winter annuals in a field fertilized with swine lagoon effluent (ns = not significant in ANOVA F test).

View larger version (17K): [in a new window]   Fig. 9. Soil test NO3 levels before (Oct. 1999) and after (Oct. 2002) the 3-yr overseeding experiment. Differences between treatments were not significant when compared within sampling depths.

View larger version (24K): [in a new window]   Fig. 10. Mehlich-3 soil test P levels before (Oct. 1999) and after (Oct. 2002) the 3-yr overseeding experiment. LSD values pertain to treatment differences within the respective sampling depths (ns = not significant in ANOVA F test).