Jose, A.I.Rao, D.V.K.NageswaraKAU2017-06-032017-06-032000http://krishikosh.egranth.ac.in/handle/1/5810014993en-USRubber, Hevea brasiliensis, Soil classification, ProductivityProductivity classification of soils under rubber (Hevea brasiliensis muell. Arg.) in KeralaThesis