Respons klon ubi jalar (Ipomoea batatas L.) var. Awachy-1 dan var. Biang terhadap aplikasi paclobutrazolResponse of sweetpotato clones (Ipomoea batatas L.) var. Awachy-1 and var. Biang to paclobutrazole application Abstract. Paclobutrazol is one type of plant growth regulators that can be used to regulate plant growth with the aim of maintaining the balance of vegetative and generative growth. Each plant genotype would produce a different responses to paclobutrazol. The aimed of this study was to determine the interaction between the concentration of paclobutrazol and two sweet potato clones and to determined the best concentration of paclobutrazol for yield of two sweet potato clones. The experiment was conducted from February to June 2017 at Ciparanje Experimental Station, Faculty of Agriculture, Padjadjaran University, Jatinangor, Sumedang Regency, West Java on 750 m above sea level. Type of rainfall of the experimental area was classified as C type according to Schmidt and Ferguson. The experiment design used Factorial Randomized Block Design that consisted of two factors and repeated four times. The first factor was sweet potato clone (Biang and Awachy 1) and second factor was the concentration of paclobutrazol (0, 50, 100, 150 ppm). The results showed that the number of tubers in Biang produced higher than Awachy 1, and the treatment of paclobutrazol with concentration of 50 ppm had the best yield (weigth of tubers per plant).