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Soil Science Division

Rice Breeding activities were initiated at Batalagoda in 1952. Fertilizer experiments to find out the response of elite breeding lines to added fertilizer were started six years later. In 1980, breeding program for stress tolerance rice varieties was initiated by Dr. D Senadeera and Dr. H Dhanapala to produce rice varieties tolerance to abiotic stress. As such salinity screening beds were established at RRDI Batalagoda and soil science activities were directed to screen rice varieties for salt tolerance. In late 80’s studies on rice straw as a source of fertilizer was started and Dr. S Amarasiri and his team initiated fertilizer experiments at Batalagoda to test the possibility of using rice straw as a fertilizer material in rice cultivation. In the meantime, separate rice plots were established at Batalagoda with no addition of any form of fertilizer to find out the long term sustainability of rice cultivation without addition of any fertilizer. In early 90s, Soil Science section was headed by Dr. WMADB Wickramasinghe and he started experiments to find out the response of improved rice varieties to added NPK fertilizer and organic manure. In 1993, Central Rice Breeding Station was converted to Rice Research and Development Institute and as a result Division of Soil Science was established at RRDI Batalagoda. 

 At the inception of Division of soil Science there were only few equipment and soil samples were sent to HORDI Gannoruwa to test the samples for soil fertility parameters.  After realizing the difficulties in soil analysis at faraway places, soil analytical facilities were strengthen in the Division of Soil Science by providing new equipment to Soil Science Division at RRDI. With these facilities Soil Science Division of RRDI became fully function soil science laboratory. As a result new NPK recommendations based on target yield for rice were introduced. In early 2000 micro nutrient studies at RRDI were started by Dr. WMJ Bandara and as a result ZnSO4 was recommended as a fertilizer for rice.  In 2005 fertilizer subsidy programme was initiated and as such use of fertilizer in rice cultivation in Sri Lanka has been increased. Therefore, in 2010 onwards `fertilizer experiments at RRDI Batalagoda were directed towards efficient use of N P and K fertilizer in paddy fields. Number of experiments were conducted by Mr. DN Sirisena and his team at research fields as well as farmers’ fields to find out ways and means to improve use efficiencies of added fertilizer in paddy fields. New fertilizer recommendation based on efficient use of N, P and K fertilizer in 2013 was the outcome of that research work. With the changing climate, soil salinity in paddy field become more concerned by the Division of Soil Science and two rice varieties (Bg 369 and Bg 310) tolerance to salinity were developed to improve productivity in salt effected paddy fields.  In 2015, bio fertilizer as a fertilizer material become popular and bio fertilizer experiments at RRDI Batalagoda was initiated by Ms. DMPS Dissanayake and Ms. SPGS Pathirana. At present, soil health, soil fertility management and improving the nutrient use efficiencies are the major thrust areas in the Division of Soil Science and as such the team headed by Dr. WMUK Rathnayake strengthens the soil analysis and fertility mapping activities in the Division.


  • Long term sustainability of soil fertility in paddy fields
  • Improving nutrient use efficiencies for maximum rice production
  • Use of bio fertilizer in rice cultivation
  • Testing of new fertilizer materials for rice
  • Soil test based fertilizer recommendation
  • Mapping of soil fertility and soil related problems in paddy fields in Sri Lanka
  • Conducting soil related rice production training programs for extension officers, farmers, students (university, agricultural schools and schools), other interested groups and TV and radio programs, field visits etc.


Research & Publications

Effect of continuous application  of glyphosate and paraquat on weed controlling efficacy, phytotoxicity and yield of wet seed rice.