Abstract
The field experiment comprising 12 advance lines of okra was carried out to assess thermal requirement for flowering and total fruit yield during rainy seasons at CCS Haryana Agricultural University, Hisar. The results revealed that okra crop required 762.4 dayoC accumulated heat units for flowering and 1600.5 dayoC accumulated heat units for total fruit yield production. Advance line HRB 108-2 required minimum for flowering (664.4 dayoC) and highest 1644.8 dayoC for total fruit production with better thermal use efficiency (9.1 kg ha-1 ºD) indicating its suitability for early and more fruits availability for longer period. Fruit yield production showed significant positive association with heat unit requirement in all the years. The R2 values of regression equation could explain the variation between 63-87% of the total variation in fruit production in okra.
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