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Cultivar x Tillage Interaction of Hard Red Spring Wheat Cultivars

Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
Plant Sci. Dept., South Dakota State Univ., Brookings, SD 57007

^* Corresponding author.

Tillage systems in the spring wheat (>Triticum aestivum L.) production areas of the North Central Great Plains are changing to control soil erosion and increase soil water conservation. Therefore, a field study was conducted under three environmental conditions to determine if there was a cultivar x tillage interaction for grain yield, plant establishment, tiller number at boot and maturity, grain volume weight, and plant height. Eighteen adapted hard red spring wheat cultivars were evaluated using two tillage systems, till and no-till, during 1985 and 1986 on a Beotia silt loam (fine-silty, mixed, Pachic Udic Haploboroll) and during 1986 on an Aberdeen silt clay loam (fine, montmorillontic, glossic Udic Natriboroll). There was a significant cultivar x tillage interaction for grain yield, with a range from a 9.8% increase to a 11.6% decrease depending on cultivar when examined over all environments. There was a cultivar x tillage interaction for seed weight (P = 0.07) and grain yield (P < 0.05). Stand establishment was superior at all locations in no-till. Tillering at various growth stages did not explain grain yield differences. This study indicated that selection under no-till should be considered to more efficiently develop spring wheat cultivars for no-till production systems.

Received for publication March 28, 1988.

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