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Effects of Potassium Nitrate on Germination and Respiration of Dormant and Nondormant Kentucky Bluegrass (Poa pratensis L.) Seed¹

Respiration rates for germinating ‘Cougar’ and ‘Newport’ Kentucky bluegrass (Poa pratensis L.) seed produced in 1965, 1968, and 1969 (freshly harvested) increased rapidly for 2 to 4 days after imbibition in 0.2% KNO₃ and in water, then slowly increased for the remainder of a 7–day period. Cougar seed treated with KNO₃ had higher respiration rates than water-treated seed; only slight increases were obtained with KNO₃-treated New port seed. Seed from 1965 and 1968 took up oxygen more rapidly than the 1969 seed. Respiration rates of 1– and 4–month-old Newport seed decreased rapidly 3 to 4 days after imbibition.

Germination tests of 1969 seed at 1 month after harvest after imbibition showed Newport seed to be more dormant than Cougar. KNO₃ increased germination of 1–, 4– and 9–month-old Newport seed but had no effect on Cougar seed.

Key Words: Seedling vigor

² Assistant Professor and Senior Laboratory Technician, Department of Agronomy and Soils, Washington State University, Pullman, Wash. 99163.

Received for publication April 23, 1970.