Syamsiyah, J., Sumarno, S., Suryono, S., Muhamat Rajab, N. E., & Aryaningrum, I. (2017). The Effects of Mixed Source Fertilizer Application on Vertisol Fertility and Growth of Mustard. JOURNAL OF TROPICAL SOILS, 22(3), 139–148. https://doi.org/10.5400/jts.2017.v22i3.139-148