Suplai Dosis P dan K Terhadap Laju Pertumbuhan dan Produksi Tanaman Ubi Jalar (Ipomea batatas L.) Varietas Antin 3

Fertilization is one of the important factors in cultivation. Plant sweet potatoes known very response to fertilization. This research has been carried out in the research of Jember State Polytechnic in April to August 2017. The purpose of this research is to know the influence of dose of fertilizer P and K as well as their interaction towards the pace of growth and the yield of sweet potato plant Antin 3 variety. The experimental design used was Randomized factorial Design Group with three replicates. The first factor is the fertilizer dose TSP (P) consists of 3 levels namely: P1 (78 kg/ha), P2 (117 kg/ha) and P3 (157 kg/ha). The second dose of KCL fertilizer factor (K) consists of 3 levels namely: K1 (150 kg/ha), K2 (300 kg/ha) and K3 (450 kg/ha). Data research are analyzed statistically according to test advanced DMRT and test F. Single dose factors P and K as well as their interaction influence are not significant against the parameters the number of branches. Single doses of P factors influence significantly against the tuber length. The best treatment (P3) with a dose of 157 kg/ha TSP. Single doses factors P and K influence significantly against the parameters of the growth rate in 6 weeks and 8 weeks, the number of tubers per plant and tuber total weight per plant. Interaction dose P and K influence significantly against tuber weight total per plot. P3K3 treatment (dose of 157 kg/ha TSP + KCl 450 kg/ha) produce highest yield i.e. 7.2 kg/plot.