Sukristiyonubowo, ., Riyanto, D. and Widodo, S. 2019. Soil Fertility Properties and Rice Biomass Production Under Three Rice Farming Systems at Vertisols Sambung Macan Sub District, Sragen Regency. JOURNAL OF TROPICAL SOILS. 24, 1 (Jan. 2019), 17–23. DOI:https://doi.org/10.5400/jts.2019.v24i1.17-23.