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A Field Technique to Study Root Growth in Peanut

Dep. of Agronomy, Univ. of Georgia, Coastal Plain Exp. Stn., P.O. Box 748, Tifton, GA 31793
Dep. of Entomology, Plant Pathology, and Weed Sci., New Mexico State Univ., Las Cruces Cruces, NM 88003
Dep. of Agronomy, Univ. of Georgia, Athens

^* Corresponding author.

Traditional techniques for the field study of root growth usually require extensive monitoring devices and a large labor force. We have developed a simple field technique to study root growth using the carotene-inhibiting herbicide, fluridone [1-methyl-3-phenyl-5-[3-(trifluoromethyl)phenyl]-4(l/H)-pyridinone]. Underground bands (0- to 15-, 20- to 35-, or 40- to 55-cm vertical depth, 5 cm in width) of fluridone were sprayed into location using fan nozzles mounted on a subsoil tine. The experiment was conducted near Tifton, GA, on a Tifton loamy sand (fine-loamy, siliceous, thermic Plinthic Paleudults). Peanut (Arachis hypogaea L.) seed were hand planted in 3- m-long rows at a 23° angle to the band. The horizontal distance from row to fluridone band varied from 0 to 1.2 m. A root growth profile was generated by measuring, three times a week, the horizontal distance from the band to the farthest plant showing leaf bleaching. This technique provided a simple and accurate method for determining root growth patterns in peanut.

Received for publication November 17, 1987.