Sarno, . “Pengaruh Kombinasi NPK Dan Pupuk Kandang Terhadap Sifat Tanah Dan Pertumbuhan Serta Produksi Tanaman Caisim”. JOURNAL OF TROPICAL SOILS 14, no. 3 (January 1, 2009): 211–219. Accessed July 19, 2025. https://journal.unila.ac.id/index.php/tropicalsoil/article/view/88.