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Frost-resistance and hardening of corn plants

Frost-resistance and hardening of corn plants

Doklady Akad Nauk Sssr [Bot Sci Sect] [Transl ] 114(1/6): 107-109

Ten varieties of corn were tested. (1) The seeds were planted out-of-doors in late Aug. and early Sept. Soil temperature reached -3.4[degree] on some days. In the 2 to 3-leaf stage the plants are more resistant than in the 4-leaf stage. Among the young plants 12 to 30% were uninjured by frost to -3.4[degree] with a northwest wind. (2) Plants were grown in the greenhouse to the 3- to 5-leaf stage and then hardened in cold greenhouses. These plants were kept 4 hours at -4[degree], as were unhardened plants. A large intervariety difference in frost-resistance occurred, but much greater differences occurred between hardened and unhardened plants. Hardening increased the relative sugar content. (3) Hardened plants were subjected to a temperature of -5[degree]. Some of the plants remained alive and retained all leaves.

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