Hasibuan NH, Fahruddin Nasution. MOTIVASI PETANI DALAM PENERAPAN PEMUPUKAN TANAMAN KAKAO (Theobroma cacao L.) DI KECAMATAN BIRU - BIRU KABUPATEN DELI SERDANG. Agrica [Internet]. 2020Dec.17 [cited 2024May3];14(2):126-3. Available from: https://ejournal.polbangtanmedan.ac.id/index.php/agrica/article/view/62