NETA NURDIANI, Efficiency of K Fertilizer Use By Applying Oil Palm Shell Biochar On The Growth And Yield Of The Bima Brebes Variety Of Shallots (Allium Ascalonicum L.)(Supervised by SUSILAWATI and MARIA FITRIANA) The research aimed to evaluate the efficiency of K fertilizer use by applying oil palm shell biochar on the growth and yield of the bima brebes variety of shallots. The research was co…