تلخیص
To compare the effect of planting time and N levels on phenology and seed cotton yield of Bt and non -Bt cotton, an experiment was laid out at Students’ Farm, University of Agriculture, Faisalabad, Pakistan. Two cotton cultivars; FH-113 (Bt) and CIM-496 (non-Bt) were planted during mid March and mid May using 115, 145 and 175 kg ha-1 N levels. Planting times were placed in main plots, varieties in sub plots and N levels in sub sub plots in randomized complete block design with three replications. All the interactions (sowing date × varieties, sowing dates × nitrogen levels, varieties × nitrogen levels, sowing dates × varieties × nitrogen levels) were non significant for parameters (Days taken to squaring, flowering, first boll splition, vertical and horizontal flower interval, boll maturation period, node above white flower, node number for first fruiting branch, first fruiting branch height, earliness index, number of monopodial and sympodial branches per plant, average boll weight per plant, seed cotton yield kg ha-1 ) under discussion except variety × sowing date for seed cotton yield. Mean values for various phenological events like days taken to squaring, first flower and first boll splition, BMP (boll maturation period), first fruiting branch height (cm), first fruiting branch node number and node above white flower varied invariably between Bt and non Bt sown at different times. Vertical as well as horizontal flower intervals remained unaffected. Maximum seed cotton yield was recorded in FH-113 at mid March planting and minimum in CIM-496 at mid May planting. A N level of 145 kg ha-1 gave maximum seed cotton yield against the minimum with 115 kg ha-1 . It was concluded that performance of Bt cotton was better in both mid March and mid May planting with respect to seed cotton yield per hectare
Muhammad Faisal Bilal, Muhammad Farrukh Saleem, Muhammad Ashfaq Wahid, Asif Saeed, Shakeel Ahmad Anjum. (2015) Varietal comparison of Bt and non-Bt cotton (Gossypium hirsutum L.) under different sowing dates and nitrogen rates, The Journal Soil & Environment , Volume 34, issue 1.
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