Yield and processing attributes of indigenous and exotic potato varieties for processing in late planted crop in NW plains

Eight Dutch and two American varieties along with newly developed indigenous processing varieties, Kufri Chipsona-1 and Kufri Chipsona-2 and 5 others were evaluated over two years (1999 and 2000) at CPRI Campus, Modipuram in NW plains in late planted crop to assess their potential in producing raw material for industry for a longer time. The highest total and processing grade yields in a crop of 100 days were recorded in cv. Kufri Anand followed by Kufri Sutlej, the two newly released varieties for table consumption and suitable for plains of India. The per cent dry matter was lowest (17.09%) in Morlena (Dutch) and highest (22.67%) in Kufri Chipsona-2 followed by in Chipsona-1 (22.22%), while reducing sugars ranged from 35.43 to 363.17mg/100g fr.wt with minimum in Atlantic followed by Kufri Chipsona-1 (45.60mg/100g fr.wt). The acceptable chip colour (grade-3) was observed only in Kufri Chipsona-1 followed by nearly acceptable chips in cv. Atlantic (grade 3.5). Sucrose varied from 143.82 in FTL-1533 to 328.49mg/100gm fr.wt. in Kufri Chipsona-1. Kufri Chipsona-1, the only variety meeting all the processing requirements, was found suitable for growing in late planted crop in NW plains and its cultivation in paddy-potato rotation can provide processing potatoes for a longer period by staggered planting starting optimally from 1st week of October. However, amount of high sucrose in cv. Kufri Chipsona-1 in late planted crop indicated its unsuitability for long term storage.