@PROCEEDINGS {MAHAPATRA:1976d, title = {Efficient use of fertilizers for rice in various agroecological situations in Sierra Leone}, author = {Mahapatra, I. C. and Kallon, J. M. }, booktitle = {Presented at the FAO/NORAD Fertilizer Conference, Njala, Sierra Leone, September 1976}, year = {1976}, month = {September}, }