Sustainment of crop production in the unfertilized, traditional rice farming, dry zone, Sri Lanka

Seneviratne, G.2023-02-062023-02-061999School Science Weekend Programme - 1999 Course Notes:p.13-14https://dl-ifs.nsf.gov.lk/handle/1/2087Sustainment of crop production in the unfertilized, traditional rice farming, dry zone, Sri LankaConference Paper