Uji Lama Pengeringan dan Tebal Tumpukan pada Pengeringan Kentang dengan Alat Pengering Surya Tipe Rak

Abstract

HENDRA SAMUEL MARPAUNG: The Effect of Drying Time and Heap Thickness on Drying of Sweet Potatoes Using Tray Type Solar Dryer, supervised by AINUN ROHANAH and RISWANTI SIGALINGGING. Drying of sweet potatoes in tray tipe solar dryer to make sweet potato flour can be a solution of food problem in Indonesia as the productivity of sweet potatoes is very high and can be made into various of type carbohydrate source of food to substitute rice and grist, and also can reduce fuel consumption. The research was performed in May-June 2012 at Agricultural Engineering Laboratory, Fakultas Pertanian USU using factorial completely randomized design with two factors i.e: drying duration: 2,3, and 4 days and heap thickness : 0.5, 1, and 1,5 cm. Parameters analysed were moisture content, yield, and organoleptic values of colour. The results showed that the drying time had highly significant effect on moisture content and yield, and had significant effect on organoleptic value of colour. Heap thickness had no significant effect on moisture content, but had highly significant effect on yield and organoleptic value of colour. The interaction of drying time and heap thickness had highly significant effect on all parameters. The best result was obtained in the combination of drying time of 2 days and heap thickness of 1 cm.