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Field Evaluation of Corn Root Clumps¹

Corn root clumps were extracted from the soil with a potato digger and rated for size on a scale from 1 (small) to 5 (large). Root clump ratings were at a maximum approximately 1 month after flowering and subsequently deteriorated .14 rating (approximately 6%) per week. Correlations between ratings and root, stalk, and total lodging were –.59*, –.58*, and –.78**, respectively. Correlations bsetween ratings and root clump weights were .92** or larger. Ratings estimates for pooled additive genetic effects were large. An evaluation advantage was indicated for the tester with a small root clump rating. This root clump method is an efficient and relatively effortless procedure for evaluating corn roots for anchorage and related factors.

Key Words: lodging • exotic corn

² Research Agronomist, Crops Research Division, ARS, USDA.

Received for publication July 27, 1967.