UtamaM. Zulman Harja. 2018. “Mekanisme Fisiologi Toleransi Cekaman Aluminium Spesies Legum Penutup Tanah Terhadap Metabolisme Nitrat (NO3 - ), Amonium (NH4 + ), Dan Nitrit (N02 - )”. Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) 36 (2). https://doi.org/10.24831/jai.v36i2.20515.