INFLUENCE OF VARIETY AND DATE OF HARVESTING ON POST HARVEST PHYSIOLOGY OF POTATO DERIVED FROM TPS AT AMBIENT STORAGE CONDITION

Abstract

The experiment was conducted at Laboratory of Department of Agronomy, Sher-e-Bangla Agricultural University (SAU), Sher-e-Bangla Nagar, Dhaka-1207 during March to August 2012 to study the influence of variety and date of harvesting on post harvest physiology of potato derived from TPS at ambient storage condition. The experiment consisted of 2 factors: Factor A: Potato variety (4 varieties) as- V 1 : BARI TPS-1, V 2 : BARI TPS-2, V 3 : HPS-364/67 and V : Lady Rosetta; Factor B: Time of harvest (4 times) as- D 1 : 80 DAP, D 2 4 : 90 DAP, D 3 : 100 DAP and D : 110 DAP. Potato variety and time of harvest had significant effect on all post harvest physiological parameters and nutritional aspects. Dry matter content, weight loss and percentage of rotten tubers increased with advancing storage period irrespective of varieties. Among varieties BARI TPS-1 was superior to those of others. All post harvest losses except apical sprout length decreased with increasing the time of harvest. Specific gravity, reducing sugar, total sugar and starch content increased with advancing storage period, whereas non-reducing sugar decreased with increasing storage period. Among the varieties HPS 364/67 was the best in respect of nutritional aspects. Due to the interaction effect of different variety and time of harvest at before storage and 20, 40, 60, 80, 100 DAS, the highest maximum dry matter in flesh (13.99, 17.75, 18.80, 19.93, 21.71 and 22.57%) was observed from V 1 D 4 and the lowest from V 1 D . The highest days required for starting of sprouting (51.67) was observed from V , while

the minimum from V 4 D . At harvest and 100 DAS, the highest total sugar (0.61% and 0.82%) was observed from V 1 4 D 4 , while the lowest total sugar from V 3 D 1

. The results revealed that BARI TPS-1 showed better storage quality. Physiological performance compared to those of other varieties when harvested at

1 1 D 3 and V 1 D 4 4100 days after planting, while HPS 364/67 showed superior nutritional quality than other varieties when harvested at the same days.