A field experiment was conducted for producing higher processing grade tuber yield and quality by evaluating in relation to different planting times (31 October, 15 and 30 November) and dehaulming dates (80, 90 and 100 days after planting) during 2012-13 potato growing season at Bangladesh Agricultural Research Institute, Gazipur. Results revealed that different growth parameters like plant height, leaves number per hill and foliage coverage were significantly influenced by planting times. Processing and non processing grade tuber number and yield were significantly affected by all the treatments and their interaction. Significantly higher yield of processing grade tuber were recorded in November 15 planting in combination with all the dehaulming dates, ranged from 20.67 to 21.50 t/ha. Processing quality parameters like specific gravity, dry matter, reducing sugar content were significantly varied by planting times, dehaulming dates and their interaction. Whereas the potato chips colour score were not affected by the planting time and dehaulming but all the processing quality parameters were remained in acceptable range. The highest net return (Tk 1,68,404/ha) with a BCR of 1.93 was obtained in November 15 planting with dehaulming at 90 days after planting.
A total of 100, day-old broiler chickens were randomly divided into 5 groups and kept under elevated temperature (34-36EC) to see the effect of ascorbic acid and acetylsalicylic acid (Sb-Asper-C, a commercial product) on the feed conversion ratio (FCR), immune status and ratio of weight of bursa, thymus and spleen to body weight. Heat stress increased the FCR but decreased the immune response and ratio of bursa, thymus and spleen to body weight of the birds. Ascorbic acid and acetylsalicylic acid supplementation during heat stress had beneficial effects on FCR, immune status and ratio of weight of bursa, thymus and spleen to body weight of the birds. Grossly, bursa thymus and spleen of heat stressed birds were atrophied but ascorbic acid and acetylsalicylic acid supplemented birds were not atrophied, No specific histopathological changes were observed in all groups.
An experiment was conducted to evaluate the storability of hybrid clones and exotic genotypes at room temperature during April to August 2011 and April to August 2012. Fourteen hybrid clones and 14 exotic genotypes were stored for five months at ambient temperature. Hybrid clones 7.33 and 7.12 showed better performance in respect of storage behaviour (minimum weight and rottage loss) at ambient temperature. The maximum storability was found in Labadia, Liseta, Albaata, Lambada and Amanda exotic genotypes. Moreover, hybrid clones 7.33 and 7.12 exhibited minimum weight and rottage loss in both the hybrid clones and the exotic genotypes. Based on their storage behaviour at ambient temperature, it may be concluded that hybrid clones 7.33 and 7.12 are found to be suitable for storage under ordinary room temperature conditions for a period of 90 to 120 days and slow release to market for avoiding distress sale.
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