| This mutant was also tested against C306 at Hisar during 1982-83 where
it gave 18.5% higher yield than C306. The crop was sown on 27th October
under rainfed conditions. The mutant flowered after 133 days of sowing in
comparison to 69 days of WH147. Extensive testing of this mutant against
C306 was done under rainfed condition during the year 1983-B4 at Hisar and
Ambala. On the basis of the average yield of 5 trials conducted at each
location, mutant gave 26.76 as against 23.25 g/ha of C306 and 35.83 as against
31.70 g/ha of C306 at Ambala and thus recorded 15 and 13% higher yield over
C306 at Hisar and Ambala respectively. The seed of this mutant was also supplied to the Department of Botany of this University for physiological studies. Physiological parameters studied by them also favoured its cultivation in rainfed conditions. Date of sowing experiments conducted by them (SHEORAN et al. 1983) confirmed its thermo-insensitivity as its period of flowering was least affected (125 to 138 days) when the crop is sown from 8th September to 10th December in comparison to WH147 (40 to 98 days). The results obtained so far clearly showed that this mutant does well in early sowings right from late September. Early sowings are usually required under rainfed situations because we can make use of residual moisture present in the soil just after cessation of monsoon. For early sowing we need varieties insensitive to temperature (ASANA 1974). Since this mutant is thermoinsensitive, hence it is most suitable for early sowings under rainfed conditions, when temperature is too high. References ASANA, R.D. 1974. Physiological response of wheat to early sowing under non-irrigated cultivation and to late sowing under irrigation. Indian J. Genet. Plant Breed. 34: 190-196 SHEORAN, I.S., M.S. KUHAD, R.K. BEHL, A.S. NANDWAL and D. SINGH. 1983. A high yielding heat insensitive mutant of wheat for early sowing. Indian J. Agri. Sci. 53(12): 1076-1078. |
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