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Use of the Thermogradient Plate as an Aid in Determining the Relative Vigor of Sweet Corn (Zea mays L.)¹

Eighteen lots of sweet corn seed (Zea mays L.) were germinated on a one-way thermogradient plate to establish a relative index for seed vigor. This index is based upon the rate and total germination over a temperature range of 13 to 43 C. Differences between lots were maximum 2 days after planting. The rankings after 4 and 7 days were the same. Significant correlations were obtained between the vigor index established with the thermogradient plate and data from percent emergence at 25, 35, 15:25 C in a controlled environment and rapid aging of 0, 4, and 7 days. The significant correlations indicate that the thermogradient plate can be used to detect differences in seed vigor of different lots of sweet corn in 4 days.

Key Words: Rapid aging • Growth chamber • Germination • Speed of Germination • Root and shoot growth

² Plant Physiologist, Seed Quality Investigations, Field Crops and Animal Products Research Branch, Market Quality Research Division, ARS, USDA, Beltsville, Md. 20705.

Received for publication February 10, 1972.