Influence of NPK fertilizers on growth of RRII 400 series clones of rubber (Hevea brasiliensis) and soil properties in Tripura during immature phase - Mandal D; Datta B; Dey S K; Pal T.K (IRC 2012. International Rubber Conference, 28-31 October 2012, Kovalam, India, Rubber Research Institute of India, Kottayam and IRRDB, Malaysia: Abstracts. pp.153-154)