| dc.description.abstract | An experiment was conducted at the Research field of Crop Physiology and
Ecology of Hajee Mohammad Danesh Science and Technology University,
Dinajpur during the period from December 2017 to April 2018 to evaluate the
growth and productivity of four maize varieties under late sowing heat stress
condition. The experiment was laid out in a Split plot design with three
replications. The experiment consisted of two factors: Factor A: Two growing
conditions (Normal and late sowing heat stress) and Factor B: Four maize
varieties (BARI Hybrid Maize-5, BARI Hybrid Maize-7, BARI Hybrid Maize-12
and BARI Hybrid Maize-14). The combined effect of sowing times and maize
varieties significantly influenced plant height, leaf length, cob length, cob girth,
tassel length, number of grains cob-1
, grains weight cob-1
, 100-grain weight, straw
yield and grain yield. Late sowing heat stress caused reduction in all growth and
yield contributing traits of maize and the degree of reduction was different to
different varieties. In respect to all growth and yield contributing traits, BARI
Hybrid Maize-14 showed comparatively better tolerance under late sowing heat
stress condition. Both under normal and late sowing heat stress condition, the
maximum grain yield (10.55 and 9.32 t ha-1
, respectively) was observed in BARI
Hybrid maize-14, whereas BARI Hybrid Maize-12 produced the minimum grain
yield (3.38 t ha-1
) under late sowing heat stress condition. However, the order of
heat tolerance based on grain yield was BARI Hybrid Maize-14 > BARI Hybrid
Maize-5 > BARI Hybrid Maize-7 > BARI Hybrid Maize-12. | en_US |
