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Differential Growth of Corn (Zea mays L.) Hybrids Seeded at Cold Root Zone Temperatures¹

Field observations, which indicated differential growth among corn (Zea mays L.) hybrids after early seeding but not after later seeding, led to a study of the growth of four hybrids in three different root zone temperature regimes. Initial root zone temperatures of 12, 16, and 20 C, respectively, were subsequently raised by 2, 1, and 0 C with each 2 weeks of growth following the initial 3 weeks after seeding. Hybrid ‘Cornell M-3’ was most sensitive to cold root zone temperatures; the hybrids ‘Michigan 250,’ ‘Cornell M-4,’ and ‘Pennsylvania 290’ followed in decreasing order of sensitivity. Percent survival and leaf number were similar for all hybrids, but dry matter accumulation differed among hybrids at the lower temperature regimes. Compared to the other hybrids, Cornell M-3 accumulated less dry weight of roots, blades, sheaths, and stems and less blade area and stem height after 11 weeks of growth in the 12-C root temperature regime. Differential growth among hybrids was less apparent when grown at 20 C.

Key Words: Germination

² Graduate Research Assistant (Present Address: Central Farm Research Station, British Honduras) and Assistant Professor, Department of Agronomy, Cornell University, Ithaca, N.Y. 14850.

Received for publication June 7, 1971.