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Item Root penetration and activity patterns of some upland crops grown on reddish brown earth soils(Sri Lanka Soil Science Society of Sri Lanka:Peradeniya, 1991) Nayakekorala, H.B.Item Human induced soil degradation status in Sri Lanka(Soil Science Society of Sri Lanka:Peradeniya, 1998) Nayakekorala, H.B.Item Hydrological implications of soil water dynamics under an alley cropping system in the mid country intermediate zone of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1998) Nayakekorala, H.B.; Mapa, R.B.; Maddumabandara, C.M.