Gebi Hiskia, et al. “THE EFFECT OF UREA, KCl, SP-36 FERTILIZER ON PRODUCTION AT SOME AGE OF NATURAL RUBBER PLANT (Hevea Brasiliensis Mull.Arg): PENGARUH PUPUK UREA,KCl,SP-36 TERHADAP PRODUKSI PADA BEBERAPA UMUR TANAMAN KARET ALAM (Hevea Brasiliensis Mull.Arg) ”. Agrifarm: Jurnal Ilmu Pertanian, vol. 11, no. 1, July 2022, pp. 55-60, doi:10.24903/ajip.v11i1.1510.