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Phenological performance in relation to yield of wheat genotypes" BAW 1051, BARI Gom 27 and BARI Gom 28 were evaluated under normal and heat stress environments. One irrigated timely sowing (ITS) and three irrigated late sowings (ILS) were imposed to provide terminal high temperature over the tested genotypes. The ITS was Nov 25 and three ILS were Dec 10, Dec 25 and Jan 10, respectively. The design followed for the trial was split-plot with 3- replications. In case of late seeding, the genotypes phased a significant level of high temperature stress that also significantly affected the required days to booting, anthesis, maturity of all genotypes including the yield and yield attributes as compared to irrigated timely sowing. In the timely sowing treatment, days to anthesis and booting decreased due to late sown heat stress condition regardless the cultivars. The phenological characteristics under heat stressed condition led the wheat cultivars to significantly lower the grain yield as compared to normal condition. In late sowing conditions (Dec 10 -Jan 10), the grain yield was reduced by (-4.50-17.8% in BARI Gom 28, 0.4-30.9 % in BARI Gom 27 and 5.8-20.4% in BAW 1051. It was also observed that grain yield was found to be reduced by about by 8.6-12.6% in BARI Gom 28, 12.8-13.5 % in BARI Gom 27 and 13.6-15.8% in BAW 1051 from irrigated timely sowing condition (ITS) for each 1°C rise in average mean air temperature during booting to maturity. On the other hand, reduction percent were less for the new varieties over the advanced line. Grain yield reduction was about (-) 1.4-2.65% in BARI Gom 28, 0.1-6.7 % in BARI Gom 27 and 1.7-6.0% in BAW 1051. So, heat tolerant tendency were more in new released varieties over advanced line in terms of yield reduction and growth performance.

Sustainable Intensification Program

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INT3262