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Delaying Flowering of Grain Sorghum Lines for Hybrid Seed Production¹

A problem facing producers of hybrid grain sorghum, Sorghum bicolor (L.) Moench, seed is using lines that have different flowering times. This study compared flaming, clipping, and applying a contact herbicide as methods to delay flowering. Two pollinator and two male-sterile lines were treated at the three-leaf stage, five-leaf stage, or both. Generally, flaming and clipping produced similar delays; applying a contact herbicide produced significantly less delay. Flaming or clipping at the three-leaf stage or five-leaf stage produced 3 to 8 days delay at Manhattan and 2 to 6 days delay at Hutchinson, Kansas. Treating the plants twice resulted in the greatest delay using all three methods at both locations.

Key Words: Flaming • Clipping • Contact herbicide • Developmental stages • Sorghum bicolor (L.) Moench

² Former NDEA Fellow (now instructor, Oklahoma State Univ.) and agronomist, Agron. Dep., Kansas State Univ., Manhattan, KS 66506, and Superintendent, South Central Kansas Exp. Field, Hutchinson, KS 67501.

Received for publication June 30, 1977.