, Phichit Agricultural Research And Development Center, Office of Agricultural Research and Development Region 2

This research had the objective to study testing of suitable cassava varieties in arid areas, Soil Series Group 35, Kamphaeng Phet Province, conducted at Wang Chaphlu subdistrict, Khanu Woralaksaburi district, Kamphaeng Phet province between May 2022 and February 2023. The experiment was planned using a Randomized Complete Block Design, with 4 replicates, consisting of 5 cassava varieties: Rayong 5, Rayong 86–13, Rayong 15, Rayong 72, and Huai Bong 90. The results showed that Rayong 86–13, Huai Bong 90 and Rayong 15 had germination percentages of 99.3, 98.7 and 96.7% respectively higher than Rayong 72 and Rayong 5. Fresh tubers were harvested at 10 months of age. It was found that Rayong 72, Rayong 15 and Huai Bong 90 were the varieties that gave high yields of fresh tubers. It also provides a relatively high percentage of starch compared to the other two varieties. The Rayong 72 variety yielded 6,215 kilograms/rai of fresh tubers, 22.5% starch content, Rayong 15 yielded 6,204 kilograms/rai of fresh tubers, 27.7% starch content, and Huai Bong 90 yielded 5,718 kilograms/rai of fresh tubers, 27.9% starch content. Rayong 15 had the highest benefit cost ratio, 4.20 followed by Rayong 72 and Huai Bong 90 which had benefit cost ratio 3.90 and 3.87. Therefore, it can be recommended that Rayong 15 Rayong 72 and Huai Bong 90 were cassava varieties with suitable potential for growing in this research area.