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Item Characterization of soil water movement in reddish brown earth soils (alfisol)(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1990) Pathmarajah, S.; Mapa, R.B.Item Sustainable soil management in the 21st century(Faculty of Agriculture, University of Ruhuna. Kamburupitiya, 2003) Mapa, R.B.Item Soils of Muthurajawela wetland and their applicability to agriculture(Soil Science Society of Sri Lanka:Colombo, 2003) Idamekorala, P.; Mapa, R.B.Item Aggregate stability of major soils in the wet zone of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1997) Jayalath, K.D.D.; Mapa, R.B.Item Spatial variability of soil texture, organic carbon and cation exchange capacity of a reddish brown latasolic soil in a slopy landscape(Soil Science Society of Sri Lanka:Peradeniya, 2011) Nayanaka, V.G.D.; Vitharana, U.W.A. .; Mapa, R.B.Item Geostatistical analysis of soil properties to support spatial sampling in a paddy growing alfisol(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2010) Nayanaka, V.G.D.; Vitharana, W.A.U.; Mapa, R.B.Item Testing time domain reflectometer on suitability for measuring soil moisture content of Sri Lankan soils(Soil Science Society of Sri Lanka:Colombo, 2001) Mapa, R.B.; Pathirana, P.H.Item Use of variability in determining the minimum sample size to estimate selected soil properties of Alfisols in Sri Lanka(Soil Science Society of Sri Lanka:Colombo, 2002) Mapa, R.B.; Wickramasinghe, S.Item Relationship between clay activity and specific surface with clay mineralogy for some major soils of Sri Lanka(Soil Science Society of Sri Lanka:Colombo, 1996) Mapa, R.B.Item Development and application of a national digital soil database for land resource planning in Sri Lanka(Soil Science Society of Sri Lanka:Colombo, 2003) Eilers, R.G.; Lelyk, G.W.; Goh, T.B.; Mapa, R.B.; Dasanayake, A.R.