Impact of inorganic, organic fertilizer and mulch to the physical and chemical characteristics of soil and production of Red Onion of Palu Valley Variety Journal title: International Journal of Farming and Allied Sciences Authors: Nur Alam, Abdul Latief Abadi, M. Luthfi Rayes, Elok Zubaidah Subject(s): Agricultural Science, Biochemistry, Plant Sciences, Soil Sciences, Zoology and Animal Science, Agricultural Economics