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Relationship of Hybrid Sudangrass Plant Populations to Plant Growth Characteristics¹

The number of plants established was not directly proportional to the number of seed planted in a seeding rate and row spacing study with a hybrid sudangrass (Sorghum bicolor (L.) Moench x S. sudanense (Piper) Stapf,). At a fixed seeding rate more plants were established in narrow rows than in wide rows. Within a row spacing, percentage establishment decreased as seeding rate increased. Within a row spacing, plant size was inversely related to plant population so that yield per ha at maturity did not differ greatly. The largest plants were in wide rows; but at a fixed population level, plant size was greater in narrow than wide rows. LAI did not increase with increased plant numbers within a fixed row spacing. Within at least a two-fold difference in plant numbers, yield was not significantly influenced by seeding rate.

Key Words: Seeding rates • Row spacings • Leaf area index • Plant size

² Professor, Soil and Crop Sciences Department, Texas A&M University, College Station, Texas.

Received for publication November 21, 1969.