NugrohoB., NadaliaD., and HanifahD. “Validating Nutrient Status Using Plus One Test Model on Latosol by Maize: Validasi Status Hara Model Plus One Test Pada Latosol Dengan Indikator Jagung Manis”. Jurnal Ilmu Tanah Dan Lingkungan, Vol. 22, no. 2, Oct. 2020, pp. 74-79, doi:10.29244/jitl.22.2.74-79.