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Soil Water Depletion Patterns under Dryland Field Conditions of Closely Related Height Lines of Winter Wheat

Dryland soil water depletion patterns of closely related height lines of three adapted hard red winter wheat (Triticum aestivum L. em Thell.) cultivars were studied. Gravimetric soil water measurements were made at 30-cm increments to a depth of 240 cm at 3-week intervals in 1975 and 1976. Two single dwarf gene near-isogenic lines and the tall parents were studied in the cultivars ‘Scout’ and ‘Wichita’. A two-dwarf gene line and tall parent was used from ‘Trapper’. Although moisture stress varied considerably between years, no relationship could be established between-soil water depletion and dwarfing genes and root development or activity. This was true when the individual time increments and depths were considered and also when total water losses from the profiles in each year were investigated.

Key Words: Triticum aestivum L. em Thell. • Root development • Dwarfing genes • Wheat adaptation • Drough response

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

Received for publication January 24, 1979.