Essential plant nutrients and deficiency symptoms, organic, inorganic and biofertilisers and their environmental costs, and surface, sprinkler and drip irrigation in Sri Lanka.
Deshapriya Senevirathne. B.Sc. (Hons) Biology Special, University of Peradeniya — graduated with a class pass. All the content and lessons in A/L Biology on Paadama are reviewed by Deshapriya Senevirathne, and the lessons are taught by him.