Ridho Ryswaldi

Department of Management, Faculty of Economic, Universitas Andalas, Padang, West Sumatra 25163, Indonesia

Article(s):

1. Vol. 11 (2021) No. 2
   Application of Sub-bituminous Coal Activated with Urea to Improve Chemical Properties of Ultisols and Palm Oil's Growth (Elaeis Guineensis Jacq.) In Pulau Punjung, Dharmasraya
   - Herviyanti, Amsar Maulana, Teguh B. Pasetyo, Trisa Omily, Ridho Ryswaldi