Open Access Peer-reviewed

Rupture Studies on Kokum Wax Coated Urea Briquettes

M. Ramananda Bhat1,, D. V. R. Murthy2, M. B. Saidutta2, Sahitya Reddivari3

1Department of Biotechnology, Manipal Institute of Technology, Manipal University, India

2Department of Chemical Engineering, National Institute of Technology Surathkal, Mangalore, India

3Graduate Research Assistant, University of Michigan, Ann Arbor, USA

World Journal of Agricultural Research. 2013, 1(5), 82-84. DOI: 10.12691/wjar-1-5-2
Published online: August 25, 2017


Applying a coating on the commercially available urea briquettes by materials such as kokum wax can assist in slowing down the dissolution of urea from briquettes in wet soils and hence the loss of urea-N occurring by various mechanisms can be minimized. Since Kokum wax coatings succumbed to rupture in wet soils, stability of the coating was assessed by subjecting coated briquettes to urea release in water. Results indicated that both observed lag period and time taken for rupture increased with increasing coating thickness. Time required for rupture increased relatively rapidly with increasing coating thickness than the lag period. Strength of the coating material, if enhanced by methods such as crosslinking, can delay the onset of rupture initiation.


briquette, kokum, wax, urea, release, coating
[1]  Kesava, R.K.,Large Granule and Slow Release Urea- A state of art report. Indian Institute of Science, Bangalore, India. 1987.
[2]  Savant, N.K., Stangel, P.J., “Urea briquettes containing diammonium phosphate.A potential new NP fertilizer for transplantedrice,”Nutrient cycling in Agroecosystem, 51: 85-94,1998.
[3]  Savant, N.K., Stangel, P.J., “Deep placement of Urea supergranulesin transplanted rice,”. Principles and practices Fertilizers Research, 25: 1-83,1990.
[4]  Omar, S. A.,“Polyethylene coated urea 1- Improved storage and handling properties,”Industrial and Engineering Chemistry Research, 28: 630-632,1989.View Article
[5]  Pansu M., Gautheyrou J.,Handbook of soil Analysis-Mineralogical, Organic and Inorganic Methods, Springer, Netherlands, p511,2006.View Article
[6]  Jarosiewicz, A.,Tomaszewska, M., Controlled Release of NPK fertilizer encapsulated by polymeric membranes.J. Agricultural and Food Chemistry, 51 (2): 413-417,2003.View Article  PubMed
[7]  Murthy, D.V.R., Ramananada, B.M., Saidutta, M.B.,“Slow release studies on commercial urea briquettes in loam and silty clay soils of Karnataka, India,”International Journal of Earth Science and Engineering,4(2): 351-356,2011b
[8]  Shaviv, A.,Smadar, R., Elina, Z.,“Modeling controlled nutrient release from polymer coated fertilizers,” Diffusion release from single granules, Environmental Science and Technology, 37: 2251-2256,2003.View Article  PubMed
[9]  Du,C., Zhou, J.,Shaviv, A., Wang, H.,.“Mathematical model for potassium release from polymer coated fertilizer,”Biosystems Engineering,88(3): 395-400,2004.View Article
[10]  Shaviv, A.,“Advances in controlled-release fertilizer,”.Advances in Agronomy, 71: 1-49,2000.View Article