Yield and Economic Response of Peanut (Arachis hypogaea L.) Cultivars to Prohexadione Calcium in Large-Plot Trials in Georgia

ABSTRACT Prohexadione calcium, a plant growth regulator, has been used on virginia market type peanut cultivars for many years to manage excessive vine and improve digging efficiency. calcium not widely runner due their slower habit sporadic yield response at the labeled rate until recent research showed lower use rates of prohexadione provided similar control enhanced response. Large plot experiments were conducted in Colquitt county Darrell Williams Research Farm Sun Belt Ag Expo quantify grade quality economics using 105 g a.i./ha six cultivars. was applied twice during growing season. The first application made when 50% or greater lateral vines from adjacent rows touching. A second each treatment 14d after application. Georgia-06G, Georgia-12Y, Georgia-13M, Georgia-14N, TUFRunnerTM-297, TUFRunnerTM-511. Similar large-plot farms Baker Early counties evaluating economic Georgia-06G. non-treated all experiments. increased pod ranging 450 650 kg/ha compared with across reduced dollar value per metric ton (DVMT) as result lowering total sound mature kernel (%TSMK) percentages up 3 points. higher yields obtained calcium-treated gross return/ha (GDR) above cost (GDRAT) on-farm trials. Therefore, g/ha is warranted financial return concern.