Abstract
Abstract The introduction of semidwarf (SD) and dwarf (DS) sunflower ( Helianthus annuus L.) plant types into production areas of the U.S. northern Great Plains prompted the initiation of research to provide answers for sunflower producers. Prior to the introduction of SD and DS types, the taller standard (SH) types were grown. Several studies comparing the agronomic performance of SD and SH types and to a lesser extent DS types were conducted. Agronomic performance of the SD and SH types were similar. The data suggest that SD types evaluated in our studies are able to tolerate higher populations than the SH type. Responses to differing planting patterns were similar. Rooting pattern and rooting depth of SD and SH sunflower hybrids of similar maturity indicated differences do exist among sunflower genotypes. Differences noted in our studies, however, were not related to plant type. Preliminary data comparing early-maturing SD and DS hybrids to later-maturing SD and SH hybrids indicate the former have shallower root systems. If early-maturing types reach maximum rooting depth at anthesis as do all other types that have been evaluated, their shallower root system would be expected.
Published Version
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