SusilaAnas Dinurrohman. 2017. “Fertilizer Recommendation: Correlation and Calibration Study of Soil P Test for Yard Long Bean (Vigna Unguilata L.) on Ultisols in Nanggung-Bogor”. Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) 38 (3). https://doi.org/10.24831/jai.v38i3.14968.