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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Mullahey, J. J.;
Roka, F.;
Fanning, M. D.;
Akanda, R. |
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| Author Affiliation: | Southwest Florida Research and Education Center, Immokalee, FL 34142; and California Polytechnic State University., San Luis Obispo, CA 93405 |
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| Title: | Effect of tropical soda apple density on bahiagrass production |
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| Section: | Weed management in turf, pastures and rangeland
Other records with the "Weed management in turf, pastures and rangeland" Section
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| Meeting Info.: | 52nd Annual Meeting, Greensboro, NC, January 25-27, 1999 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 52, 1999, p. 76. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Solanum viarum; Density; Paspalum notatum; Competition
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| Abstract/Contents: | "Tropical soda apple (Solanum viarum Dunal) is a non-native invasive plant that threatens agricultural land and natural systems in Florida. This plant displaces desirable vegetation resulting in lower agricultural production and reduced biodiversity in natural areas. Extensive research has focused on chemical control, weed biology and ecology, and integrated management strategies. Information is lacking on the effects of tropical soda apple (SOLVI) on bahiagrass production in pasture systems. Tropical soda apple plants shade the bahiagrass resulting in lower forage production. Also, SOLVI plants have prickles that can restrict cattle grazing. A competition experiment between bahiagrass and SOLVI was conducted in 1995 and 1998. Plots (11'X 11') were arranged in a randomized complete block design and replicated four times. Plant density was established as 0, 6, 12, and 20 SOLVI plants per plot. All plots had a good stand of bahiagrass prior to planting the SOLVI plants. SOLVI transplants were grown in the greenhouse and planted in the field in early March of both years. Plots were fertilized biweekly and irrigated as needed. In August of both years, the SOLVI plants (leaves, stems, roots) and the bahiagrass were harvested and oven-dried (140 F) for 3 days to determine dry matter yield. All fruit on the harvested SOLVI seed was collected, sorted and counted by size (diameter) of fruit. Based on fruit size, the number of SOLVI seed was estimated. Bahiagrass yield, SOLVI fruit and seed data were analyzed using regression analysis. From the bahiagrass yield data, an economic analysis determined the cost of supplemental forage (hay) to replace the lost bahiagrass, and the lost revenue associated with lower bahiagrass production. Results indicated that as SOLVI density increased, bahiagrass declined. With a significant (p<0.05) year x treatment interaction, each year was analyzed separately. In 1995, there was a significant linear decline in yield (Y= 12845.5-506.9x;r²=.91) compared to a quadratic response in 1998 (Y= 8766.5-474.9x + 13.7x²;r²=.76). Based on bahiagrass yield, grazing days were highest for the control (378 days) and declined to only 131 days for the high SOLVI density. SOLVI seed production had a linear increase (Y=23323.1 + 33412.3x;r²=.98) with an increase in SOLVI density. To compensate for the lower bahiagrass production per acre associated with each SOLVI density, a rancher would have to purchase $101, $213, or $318 in hay for the low, medium, an high SOLVI densities, respectively. From the loss in bahiagrass production, revenue per acre was calculated based on stocking rate. As SOLVI density increased, revenue declined $16, $33, and $49 per acre compared to the control (no SOLVI). This loss in revenue for each density level is higher than the cost of controlling SOLVI." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: REAL |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Mullahey, J. J., F. Roka, M. D. Fanning, and R. Akanda. 1999. Effect of tropical soda apple density on bahiagrass production. South. Weed Sci. Soc. Proc. 52:p. 76. |
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MSU catalog number: SB 611 .S6 v.52 |
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