Sweet Potato Hotbed Research Projects
In the first three years of this project, alternative fumigants were evaluated using a randomized block split-plot design with three replications.
Main plots consisted of six fumigation treatments: 1) untreated control; 2) MeBr + Pic 53/47% at 350 lbs/A; 3) Pic-Chlor 60 (1,3-D + Pic) at 45 gallons/A; 4) metam sodium 40 gallons/A + 1,3-D 12 gallons/A shanked, incorporated, and rolled; 5) Pic only at 150 lbs/A; 6) flat solarization. Split-plot treatments include two different fungicides and herbicides: Devrinol (napropamide) 4 lbs/A; Valor (flumioxizin) 1.0 oz/A; Valor at 1.5 oz/A; Botran (dichloro nitroaniline) 3.5 lbs per 14 gallons per 1000 sq ft; Mertect (thiabendizole) 30 fl oz per 14 gallons per 1000 sq ft; untreated control.
Split plots were 8 ft x 12.5 ft (100 ft2). Fumigation and solarization treatments were installed in the summer and fall of 2007 - 09; herbicide and fungicide applications were made after bedding in spring of 2008 – 2010. Plots were evaluated for weed pressure, nematodes, root rotting caused by Pythium fungi, and plant production.