Abstract

An experiment was conducted to determine if a delay in thinning would adversely affect growth and yield of grain sorghum [Sorghum bicolor (L.) Moench]. Results showed that thinning should be performed as early as possible, preferably before plants reach 7.5 cm in height. Yield was reduced when thinning was delayed until plants were 15.0 cm to 23.0 cm in height. Stem diameter was reduced and seed size was increased when thinning was delayed until the plants had reached a height of over 31 cm. We suggest that when a delay in time of thinning is anticipated, planting to a desired population based on reliable laboratory germination tests may be preferable.

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