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Nitrate Uptake Effectiveness of Different Cultivars of Triticale, Wheat, and Rye¹

Nitrate absorption and utilization vary among plant species and varieties but there is little information on the nitrate uptake effectiveness of triticale (X Triticose. cale, Wittmack), wheat (Triticum aestivum L.), and rye (Secale cereale L.). The nitrate uptake effectiveness of different cultivars of triticale, wheat, and rye were investigated in a growth chamber, using nutrient solutions. Plants were grown in pots containing the same base solution for 28 days before being transferred to solutions containing different nitrate concentrations. The solutions contained 0.1, 1.0, 2.5, 5.0, and 10.0 mM nitrate. Increasing nitrate concentration from 0.1 to 2.5 mM increased plant dry matter and N uptake. Few significant differences were observed at nitrate concentrations greater than 2.5 mM. Root uptake coefficients decreased with increasing nitrate concentration. Triticale '6TA 385', 'Arthur' wheat, and 'Abruzzi' rye showed higher effective ness than triticale '6TA 203', 'Atlas 66' wheat, and 'Vitagraze' rye in the uptake of nitrate at 0.1 and 1.0 mM nitrate concentrations but these differences were not obtained at higher nitrate concentrations. Varietal differences within species indicated that triticale, wheat, and rye had similar nitrate uptake effectiveness

Key Words: Nitrate levels • Net dry matter • Net N uptake • Inflow rates • Root uptake coefficient • X Triticosecole Wittmack • Secale cereale L. • Triticum aestivum L.

² Associate professor of soil science, Alabama A&M Univ., adjunct professor, Dep. of Biophysics, Michigan State Univ., E. Lansing, Mich., and associate professor, Dep. of Soil and Plant Sci. Univ. of Arkansas at Pine Bluff.

Received for publication November 2, 1978.