Supriyadi, S., B. W. Widjajani, and E. Murniyanto. “The Effect of Rice Husk Biochar and Cow Manure on Some Soil Characteristics, N and P Uptake and Plant Growth of Soybean in Alfisol”. JOURNAL OF TROPICAL SOILS, vol. 27, no. 2, Mar. 2022, pp. 59-66, doi:10.5400/jts.2022.v27i2.59-66.