Irawan, D., Nugrahini, T. and Mahdalena (2013) “Effect of Fertilizer Manure on Growth Swallow Seed Varieties Some Rubber (Hevea brasiliensis Muell Arg): Pengaruh Pemberian Pupuk Kotoran Burung Walet Terhadap Pertumbuhan Beberapa Varietas Bibit Karet (Hevea brasiliensis Muell Arg”, Agrifarm: Jurnal Ilmu Pertanian, 2(1), pp. 7–10. Available at: https://ojs.uwgms.ac.id/index.php/agrifarm/article/view/1248 (Accessed: 25 April 2026).