PeanutA gronomy J our n al • Volu me 102 , I s sue 2 • 2 010 469 ABSTRACT Seed quality of peanut (Arachis hypogaea L.) is infl uenced by seed Ca concentration, which is known to be aff ected by seed size and soil Ca fertility during seed production. Little is known about soil Ca requirements for large-seeded runner-type cultivars or for late maturing peanut cultivars that display poor seed quality. Th is study was conducted to determine if excess Ca fertilization during seed production would improve the laboratory germination and/or seedling emergence of large-seeded runner-type peanut cultivars ('C-99R' and 'AP-3') and late-maturing runner-types ('DP-1' and C-99R). Trials were conducted near Marianna, FL, in 2005, 2006, and 2007 using four cultivars and four gypsum treatments (0, 784, 1568, and 2352 kg ha -1 ) to provide excess soil Ca. Pretreatment soil extractable (Mehlich-1) Ca was 589 kg ha -1 in 2005, 811 kg ha -1 in 2006, and 848 kg ha -1 in 2007, all of which are above the recommended level.Th e cultivar average seed size (g/100 seeds) ranking was C-99R > AP-3 > DP-1 > 'Georgia Green', whereas average seed Ca concentration (mg kg -1 ) ranked Georgia Green > AP-3 = C-99R > DP-1. Cultivar seedling emergence ranking was Georgia Green = AP-3 > C-99R > DP-1 and germination ranked Georgia Green = AP-3 > C-99R = DP-1. Th ese results suggest that the relatively poor emergence of DP-1 may be, in part, related to its relatively low absorption of seed Ca during seed production. Emergence of C-99R increased as Ca fertilization increased in 2005, but not in 2006 or 2007. Th ese results suggest that seedling emergence of some large-seeded cultivars, like C-99R, may require greater gypsum fertilization if soil Ca levels are marginal during seed production.Abbreviations: ICP, inductively coupled plasma spectrophotometry; TSMK, total sound mature kernels.

Variety choice is a critical management decision in producing a peanut crop. Since several good peanut varieties are available, it is essential to know each variety’s attributes and how different varieties might fit into a farm plan. This 7-page fact sheet provides data conducted from trials in Florida at UF/IFAS research centers located in Gainesville (Citra), Marianna, and Jay from 2010–2013. Written by Barry Tillman, Mark Gomillion, Justin McKinney, and George Person, and published by the UF Department of Agronomy, May 2014.

SS-AGR-330, a 10-page illustrated report by B.L. Tillman, M.W. Gomillion, J. McKinney, G. Person, and W.D. Thomas, provides data from University of Florida peanut trials conducted in Florida at IFAS research centers located in Gainesville (Citra), Marianna, and Jay from 2006–2009. Published by the UF Department of Agronomy, March 2010.

SS-AGR-331, a 5-page illustrated fact sheet by B.L. Tillman, M.W. Gomillion, J. McKinney, G. Person, W.D. Thomas, and C. Smith, presents ideas for comparing the performance of varieties on a “farm scale” that will give peanut growers tools to accurately evaluate peanut varieties on their own farm. Published by the UF Department of Agronomy, March 2010.

SS-AGR-311, an 8-page illustrated report by Barry Tillman, Dan Gorbet, Mark Gomillion, Justin McKinney, George Person, and Bill Thomas, provides data from University of Florida peanut variety trials conducted in Florida at IFAS research centers located in Gainesville (Citra), Marianna, and Jay from 2004-2007. Published by the UF Department of Agronomy, December 2008. Reviewed April 2011.