doli jerry situmeang, R. Girsang, and T. Sulastri, “The Influence Of Cow Urine Fertilizer, Leaf Bokashi, And AB Mix For The Growth Of Water Spinach Plant (Ipomoea Reptans Var.Poir) With The DFT (Deep Flow Technique) Hydroponic System At Adventist University Of Indonesia”, isc, vol. 7, no. 1, pp. 1879-7894, Dec. 2019.