EVALUATION OF WHEAT GENOTYPES IN RESPECT OF GROWTH, PHYSIOLOGY, YIELD ATTRIBUTES AND YIELD UNDER SOWING TIMES AND IRRIGATION LEVELS

Abstract

To detect the effect of prevailing air temperature on growth, physiology, yield and yield contributing characteristics of wheat genotypes and to identify heat and drought tolerant genotype under optimum and late sowing conditions, the experiment was conducted at the Research field, Bangladesh Wheat and Maize Research Institute, Nashipur, Dinajpur during wheat season November 2018 to April 2019. The experiment was consisted with three factors naming two sowing times viz. i) S1=Optimum sowing (sowing at 6 December), and ii) S2=Late sowing (sowing at 23 December); four levels of irrigations viz. i) No irrigation (drought condition i.e. water stress), ii) one time irrigation, iii) two times irrigated condition, and iv) three times irrigation; and six wheat genotypes viz., i) BARI Gom 32 (V1), ii) BAW 1147 (V2), iii) BAW 1243 (V3), iv) BAW 1290 (V4), v) BAW 1297 (V5), and vi) BAW 1317 (V6) where BARI Gom32 was as check variety. The experiment was laid out in a split-plot with three replications. BARI Gom32 yielded the highest yield (5.6 t ha-1) in optimum sowing conditions when was provided two times irrigation. In late sowing condition, the genotype BAW 1147 (V2) produced the longest spike length(12.7), highest number of grains spike-1 (49.9) and spikelet spike-1 (18.7), and finally produced the maximum grain yield (4.74 t ha-1) when three times irrigation was applied followed by the genotype BAW 1317. Considering the results the genotype BAW 1147 is a promising genotype in drought prone areas and can be grown at late sowing condition.