oleh Ermadani, -; Graduate Program of Agricultural Sciences, Andalas University, Padang Indonesia , Hermansah, -; Department of Soil Science, Faculty of Agriculture, Andalas University, Padang, Indonesia , Yulnafatmawita, -; Department of Soil Science, Faculty of Agriculture, Andalas University, Padang, Indonesia , Syarif, Auzar; Department of Agronomy, Faculty of Agriculture, Andalas University, Padang, Indonesia , Lenin, Ismon; West Sumatera Assessment Institute for Agricultural Technology, Solok, Indonesia

oleh Hermansah, -; Department of Soil Science, Faculty of Agriculture, Andalas University, Padang, Indonesia , Ermadani, -; Graduate Program of Agricultural Sciences, Andalas University, Padang , Indonesia , Yulnafatmawita, -; Department of Soil Science, Faculty of Agriculture, Andalas University, Padang, Indonesia , Syarif, Auzar; Department of Agronomy, Faculty of Agriculture, Andalas University, Padang, Indonesia , Rusman, Bujang; Department of Soil Science, Faculty of Agriculture, Andalas University, Padang, Indonesia