Ninda Meiditia Putri; NoviardiR.; HindersahR.; SuryatmanaP. The Effect of Topsoil and Organic Manure Towards Length of Vein and Number of Laeves of Sweet Potatoes (Ipomoea Batatas Lamb.) in Gold Tailing: Pengaruh Topsoil Dan Pupuk Organik Terhadap Panjang Sulur Dan Jumlah Daun Tanaman Ubi Jalar (Ipomoea Batatas Lamb.) Pada Media Tailing Emas. J. Il. Tan. Lingk. 2021, 23, 33-37.