Performance of single cross maize hybrids during winter season of northern India

Nineteen maize single cross hybrids were evaluated in northern India under severe cold stress in natural conditions during rabi 2010–11. Data were recorded on yellowing of leaves, drying of leaves and level of growth at seedling stage at two stages viz. immediately after sever cold and frosting, and after the temperature has slightly increased to observe the recovery in maize plants. Vivek Hybrid 9, Vivek QPM 9 and JH 3459 in early/extra-early maturity, HM 9 in medium maturity and HM10 and Seed Tech 2324 in late maturity group are suitable for sowing in the winter season. Yellowing of leaves caused by cold spell proved to be an important parameter to judge cold tolerance at vegetative stage.