Sofyan, E. T.; Machfud, Y.; Yeni, H.; Herdiansyah, G. Absorption of N, P and K Nutrients of Sweet Corn Plants (Zea Mays Saccharata Sturt) Due to the Application of Urea, Sp-36, Kcl Fertilizers and Biofertilizer on Fluventic Eutrudepts from Jatinangor. j.agrotek indonesia 2019, 4.