http://www.digital.lib.esn.ac.lk//handle/123456789/3693 2026-04-21T18:15:40Z http://www.digital.lib.esn.ac.lk//handle/123456789/3812 Performance Of Six Improved Promising Rice Entries Of Medium Duration In The Eastern Sri Lanka Kumuthini D. Harris http://www.digital.lib.esn.ac.lk//handle/123456789/3811 Performance Of Improved Promising Rice Entries Of Short Duration In The Eastern Region Of Sri Lanka, Kumuthini D. Harris http://www.digital.lib.esn.ac.lk//handle/123456789/3810 PROFITABILITY OF PADDY PRODUCTION IN THE COASTAL REGION OF THE AMPARA DISTRICT A.N. AHMED, A.M. RAZMY This study attempted to show the profitability of paddy production in the coastal region of the Amparai district. This region consists of nine district secretariat divisions and 69% of paddy land areas of Amparai district and produces of 77% of the total district paddy production with the average yield of 4900 kg per hectare. The information needed for this study were collected through a structured, pre-tested questionnaire for Maha 1999/2000 and Yala 2000. Totally 250 paddy farmers were selected for this study using double stratified random sampling technique. The stratifications were carried out across the extent and the system of irrigation. Considering the similarity in paddy cultivation practices the study areas were combined together and formed into three groups namely Nintavur (ND), Sammanthurai (SD) and Akkaraipattu (AD) divisions with sample size of 50, 125 and 75 respectively. The study mainly analyses the cost of production (COP), yield, income and Cost-benefit ratios of paddy cultivation. There was no significant difference in COP between two seasons for the farmers from ND & AD in case of SD farmers COP was Rs 2007.00 ± 1,173.00 greater than in Maha season. Based on the analysis on yield, farmers from ND obtained higher yield than the other farmers for both seasons. When the profit was compared, the SD farmers obtained a slightly higher yield than the ND and AD farmers. With regard to total income received from the paddy cultivation ND farmers obtained higher income than the other farmers. During the study period there was no difference observed in selling price of paddy between seasons and also no significant differences obtained in selling price between three divisions. The study also revealed that the farmers obtained low return to their investment due to improper practices used in the paddy cultivation. http://www.digital.lib.esn.ac.lk//handle/123456789/3809 IDENTIFICATION OF NITROGEN AND PHOSPHATE SOURCES FROM KATTANKUDY TO THE BATTICALOA LAGOON. M. C. Farhdeepha, T. Thiruchelvam This paper details an investigation that was conducted to find out the sources of nitrogen and phosphate from different origins in the Kattankudy area in the Batticaloa district for their contribution to the pollution of the Batticaloa lagoon. Analysis of waste water samples collected from waste water channels C1 to C5, and lagoon water collected from locations L1 to L5 (in the study area) twice a month from April 2001 to July 2001 reveal that: a) a considerable amount of nitrogen and phosphate being contributed by channels C1 , C4 and C5 b) high amounts of nitrogen is contributed from channels C4 and C5 and c) that phosphorous is contributed through channels C1 and C5. The sources of phosphates have been identified as animal and human excreta. Furthermore, it is also found that sewage decomposition and excreta from both human and animals are the major sources for the nitrogen found in the Kattankudy area. It is noted that eutrophication by these elements ha