Research Article 
Estimation of Essential Hybrid Vigor Levels for Economical Hybrid Cotton Production
Ihsan Ullah, M. Kausar Nawaz Shah and Hafeez-ur-Rehman
Asian Journal of Plant Sciences, 2003, 2(14), 1004-1007.
Abstract
Exploitation of hybrid vigour provides a potential mean to enhance cotton production, provided some of the basic shortcomings are adequately managed. Beside labour, number of crossed bolls after manual emasculation and fertilization and number of seeds per crossed boll are important determinants of ultimate cost of hybrid seed production. It was intended to determine the essential hybrid vigour level in upland cotton to compensate the extra cost incurred on the production of cotton hybrid seed. The results of the present study indicated that the period and time of pollination are important factors in increasing crossed boll setting percentage. Maximum crossed boll retention was found from 1st to 3rd week of September where as flower pollinated before 1000 h had maximum chance of survival. Essential hybrid vigour level was determined to 35%. Specific combinations showing less than 35% heterosis would not be commercially economical.
ASCI-ID: 7-525
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