Abstract:
High temperature especially effects terminal end of inflorescence during anthesis and grain filling period thus significantly reducing quality and yield of wheat. The main complication with late sown wheat is high temperature during reproduction process that effects the grain yield. So the present study was planned to screen four wheat genotypes with two check varieties for high temperature tolerance. The study was laid out at experimental Farm of NIA, Tandojam during 2011-12. The minimum, maximum temperatures and humidity were recorded during the experiment. Grain yield and associated traits in genotypes of wheat significantly decreased under late sowing. About 15.8% and 14.0% reduction was measured in days to heading and maturity, respectively in late-sown trial. Morphological traits viz., plant height, spike length, spikelets per spike, grains/spike, 1000-grain weight, biological weight and grain yield/plant also decreased by 9.4, 17.4, 11.2, 11.4, 20.4, 62.2 and 54.8 %, respectively under late sowing as compared to normal sowing. The late sowing showed least effect on MSH-36 and Sarsabz in comparison to other genotypes. Maximum 1000-grain weight (43.0 g) was obtained under MSH-36 and bold seeds in MSH-3 and NIA-8/7. Maturity period of the wheat also decreased (16.8 %) under late sown wheat. So, the genotypes MSH-36 and Sarsabz were found superior to cultivate under late sowing and MSH-3 and NIA-8/7 under normal sowing conditions.
Keywords:
Biological yield
,
grain yield
,
wheat
,
heat
,
Late sowing
,
100grain weight