Pengaruh Frekuensi Penyetekan dan Jumlah Tanaman per Lubang terhadap Pertumbuhan dan Produksi Umbi Benih Kentang G0 (Solanum tuberosum L.) Varietas Granola = Effects of Cutting Frequency and Plant Number per Hill on Growth and Production of Potato Tuber Seeds of G0 Granola Variety - Telaumbanua, Yulianus (Program Studi Agroekteknologi FPB-UKSW, 2018)