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Soil-Water Use by Semidwarf and Tall Winter Wheat Cultivars under Dryland Field Conditions¹

An experiment was conducted to evaluate soil-water extraction patterns among two tall and three semidwarf winter wheat (Triticum aestivum L. em Thell.) cultivars in 1972 and 1973 under field conditions in eastern Colorado. Change in soil-water content was used as the indicator of root development and activity. Soil water was determined using neutron scattering at 2-week intervals at 30-cm increments to a depth of 270 cm during the growing season. The cultivars did not differ significantly for total amounts of water used or for water extraction patterns over tune and profile depths. Consequently, there was no relationship between semidwarfing genes and amounts and pattern of water uptake in the dryland winter wheat cultivars investigated.

Key Words: Triticum aestivum L. em Thell. • Soil water • Neutron scattering • Roots • Rooting patterns • Rooting depths

² Former graduate research assistant, and professor, Dep. of Agronomy, Colorado State Univ., Fort Collins, CO 80523.

Received for publication August 20, 1979.