International Journal of Mathematical, Engineering and Management Sciences Vol. 5, No. 3, 395-404, 2020 https://doi.org/10.33889/IJMEMS.2020.5.3.033 395 Development and Formulation of an Organic Fertilizer from Industrial and Agricultural Waste to Study the Growth of Marigold (Tagetes) Plant Subhasish Majee Department of Chemical Engineering, National Institute of Technology Durgapur, West Bengal, 713209, India. E-mail: subhasish.prochem@gmail.com Gopinath Halder Department of Chemical Engineering, National Institute of Technology Durgapur, West Bengal, 713209, India. E-mail: gopinath_haldar@yahoo.co.in R. N. Krishnaraj Department of Chemical and Biological Engineering, South Dakota School of Mines and Technology, Rapid City, SD, USA. E-mail: Navanietha.Rathinam@sdsmt.edu Tamal Mandal Department of Chemical Engineering, National Institute of Technology Durgapur, West Bengal, 713209, India. Corresponding author: prof.tamalmandal@gmail.com (Received February 15, 2019; Accepted February 16, 2020) Abstract The present study focused on the utilization of solid wastes viz. wet blue leather of leather industry, rice husk ash from rice mills, and water hyacinth in addition to a commercial steamed bone meal for the invention of nutrient-enriched organic fertilizer. To produce NPK organic fertilizer, chromium-free wet blue leather (WBL) as nitrogen source was amalgamated with rice husk ash, water hyacinth, and commercial steamed bone meal as a potassium and phosphorus source. The efficiency of such developed organic fertilizer designated as type I was tested as a nutrients source on the marigold plant. Ammonia analysis of fertilizer applied soil samples revealed that the content of liberated free ammonia in the soil fertilized with organic fertilizer was 44.80 %, 20.70 %, and 10.35% higher than the natural soil, chemically fertilized soil and fertilized with vermicompost respectively. Application of developed organic fertilizer and vermicompost designated as type II on marigold plant resulted in significant growth which are comparable to those obtained with commercial Chemical fertilizer. The plant growth increased by chemical fertilizer, Type I fertilizer, and Type II fertilizer in terms of plant height 26.5 %, 20 %, 22.7% and leaf size 21.2 %, 15.4 %, 17.3 % respectively which are observed to be higher than the growth of the control plant. Keywords- Wet blue leather, Rice husk ash, Organic fertilizer, Vermicompost, Plant growth. 1. Introduction Continuous apply of chemical fertilizers, showing negative impact on the soil environment. Long exposure of such chemical fertilizer gives a deleterious effect on soil characteristics and fertility (Shimbo et al., 2001). Need enhancing organic inputs to reduce weakening soil quality of the agricultural field (Kochakinezhad et al., 2012). To overcome this problem, people are trying to develop organic fertilizer, which can be used as an alternative to chemical fertilizer (Nogueira et