Rooting Patterns of Semi‐dwarf and Tall Winter Wheat Cultivars under Dryland Field Conditions1

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Abstract
The rooting patterns of two tall and three semi‐dwarf winter wheat (Triticum aestivum L. em Thell.) cultivars were evaluated under dryland field conditions in eastern Colorado. Radioactive phosphorus (32P) was foliar applied at the soft dough stage of plant development and allowed to distribute through the root system for a 5‐ day period. Root systems were then evaluated by measuring the relative distribution of radioactivity in soil‐root cores at 30‐cm increments through the soil profile to a 300‐cm depth. Soil moisture contents, determined at harvest, were used to compare the five cultivars for associated soil profile moisture contents. We found no significant relationships between cultivar height and rooting depth or moisture extraction patterns. All cultivars rooted to a minimum depth of 300 cm both years of this experiment.

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