Journal of Agricultural Studies ISSN 2166-0379 2017, Vol. 5, No. 2 http://jas.macrothink.org 181 Assessment of Paddy Soil Quality Index Based on Differences in the Productivity of Paddy in Wonogiri Regency Supriyadi Departement of Soil Science, Faculty of Agriculture, Sebelas Maret University, 57101, Surakarta, Indonesia E-mail: supriyadi.tanah.fpuns@gmail.com Retno Rosariastuti Departement of Soil Science, Faculty of Agriculture, Sebelas Maret University, 57101, Surakarta, Indonesia E-mail: retnobs@yahoo.co.id Pranoto Departement of Chemistry, Faculty of Science and Mathematic, Sebelas Maret University, 57101, Surakarta, Indonesia E-mail: pak_pran@yahoo.com Fitria Okvitasari Departement of Agrotechnology, Faculty of Agriculture, Sebelas Maret University, 57101, Surakarta, Indonesia E-mail: vitriaokvitasari@gmail.com Received: August 8, 2016 Accepted: June 20, 2017 Published: June 29, 2017 doi:10.5296/jas.v5i2.9742 URL: https://doi.org/10.5296/jas.v5i2.9742