Sugar quantity of Kaentawan (Helianthus tuberosus L.) on different part of tuber

Abstract

Relationship between sugar content and total soluble solid (brix) were highly correlated in most crops.Determination of sugar content using hand refractometer in kaentawan (Helianthus tuberosus L.) might beinaccurate if variations in total soluble solid in different tuber parts do exist. The objective of this study was tocompare total soluble solid measured in different tuber parts of different varieties of kaentawan, A 4x3x5 factorialdesign in a completely randomized design with 4 replications was used. Four kaentawan varieties (JA 89, JA 102,CN 52867 and KKU Ac 001) were assigned as factor A, three tubers of each varieties randomly selected wereassigned as factor B and five tuber parts (basal, middle, tip, bud near basal part and near middle part) assignedas factor C. Data were recorded at 85 and 95 days after planting (DAP). Significant variation for total soluble solidwere observed among the kaentawan varieties and different tuber parts at different ages. CN 52867 had the highesttotal soluble solid (24.24 brix), whereas JA 89 had the lowest total soluble solid (19.13 brix) at 85 days after planting(DAP). Bud near basal part and bud near middle part had the highest total soluble solid of 22.13 and 22.36 brix,respectively. At 95 DAP, KKU Ac 001 and CN 52867 had the highest total soluble solid of 19.29 and 19.11 brix,respectively, whereas JA 102 had lowest total soluble solid of 17.16 brix. Tuber tip, bud near basal part and nearmiddle part had the highest total soluble solid of 19.96 and 19.87 and 20.35, respectively, and significantly higherthan did basal tuber and middle tuber.