Your search found 21 records
1 Dharmasena, P. B.. 1985. System loss studies of village tanks. Tropical Agriculturist, 141:95-108.
(Location: IWMI-HQ Call no: P 1311 Record No: H02217)
2 Dharmasena, P. B.; Keerthiratna, G. B. 1988. Agroclimatic analysis of selected locations in the dry zone of Sri Lanka. Andhra Pradesh, India: ICRISAT. vp.
Arid zones ; Agriculture ; Climate ; Rain ; Water balance ; Soil moisture ; Policy ; Crops ; Simulation / Sri Lanka
(Location: IWMI-HQ Call no: 551.6 G744 DHA Record No: H04317)
3 Dharmasena, P. B.. 1989. Optimum utilization of the storage in village tanks. Tropical Agriculturist, 145:1-11.
(Location: IWMI-HQ Call no: P 2046 Record No: H09090)
4 Dharmasena, P. B.. 1995. Sedimentation and desiltation of minor tanks. In Haq, K. A.; Wijayaratne, C. M.; Samarasekera, B. M. S. (Eds.), Summaries of papers presented at Irrigation Research Management Unit seminar series during 1994. Colombo, Sri Lanka: IIMI. pp.11.
(Location: IWMI-HQ Call no: IIMI 631.7.8 G744 HAQ Record No: H016793)
(0.03 MB)
5 Dharmasena, P. B.. 1994. Conservation farming practices for small reservoir watersheds: A case study from Sri Lanka. Agroforestry Systems, 28:203-212.
Watershed management ; Reservoirs ; Traditional farming ; Agroforestry ; Case studies ; Erosion ; Soil conservation ; Rainfall-runoff relationships / Sri Lanka
(Location: IWMI-HQ Call no: P 4118 Record No: H017672)
6 Dharmasena, P. B.. 1996. Planning strategies for crop diversification in minor irrigation schemes. In Marambe, B.; Sangakkara, U. R.; Haq, K. A. (Eds.), Crop diversification strategies for minor irrigation schemes: Proceedings of the workshop organized by the Irrigation Research Management Unit, Irrigation Department and the Sri Lanka National Program, International Irrigation Management Institute, held at the Irrigation Department, Colombo, Sri Lanka on 20 February 1996. Colombo, Sri Lanka: Sri Lanka. Irrigation Department. IRMU ; IIMI. SLNP. pp.37-51.
Crops ; Diversification ; Planning ; Rice ; Farmers' attitudes ; Tank irrigation ; Irrigation programs ; Irrigation management ; Small scale systems ; Water management ; Groundwater / Sri Lanka
(Location: IWMI-HQ Call no: IIMI 631.7.2 G744 MAR Record No: H019769)
7 Karunasena, K. G. J.; Marambe, B.; Sangakkara, U. R.; Dharmasena, P. B.. 1997. Productivity of rice and chilli under village tanks of Sri Lanka in Maha season with respect to resource utilization. In Kumaragamage, D. (Ed.), Tropical agricultural research. Vol.9, 1997 Peradeniya, Sri Lanka: PGIA. pp.168-181.
Rice ; Crop production ; Cropping systems ; Labor ; Tank irrigation ; Villages ; Resource management / Sri Lanka / Ambalegoda Tank / Elapathwewa Tank
(Location: IWMI-HQ Call no: 630.72 G744 KUM Record No: H023278)
8 Dharmasena, P. B.; Fleddermann, A.; Weerakoon, W. L. 1998. A stride towards micro-level water management in Sri Lanka: research and applications. Paper 53 of Session 18. In International Irrigation Management Institute (IIMI). National Water Conference on Status and Future Directions of Water Research in Sri Lanka, BMICH, Colombo, Sri Lanka, 4-6 November 1998. Session 16: Watershed management III; Session 17: Water scarcity; Session 18: Efficient irrigation. Research papers presented. 13p.
Irrigation management ; Small scale systems ; Rain-fed farming ; Water harvesting ; Bunds ; Pitcher irrigation / Sri Lanka / Lokahettigama
(Location: IWMI-HQ Call no: IWMI 333.91 G744 INT Record No: H023544)
(0.56 MB)
9 Dharmasena, P. B.; Goodwill, I. M. 1999. Use of groundwater in minor tank irrigation schemes of Sri Lanka. In ICID, 17th Congress on Irrigation and Drainage, Granada, Spain, 1999: Water for Agriculture in the Next Millennium - Transactions, Vol.1D, Q.48, Poster Session: Irrigation under conditions of water scarcity: Q.48.2: Techniques to promote water saving in irrigation; 48.3: Conjunctive use of surface and ground water; 48.5: Environmental implications of water scarcity conditions. New Delhi, India: ICID. pp.175-194.
Tank irrigation ; Water shortage ; Water balance ; Groundwater ; Wells ; Climate ; Land use / Sri Lanka / Anuradhapura District / Nachchaduwa Tank / Siwalakulama Watershed / Puliyankulama
(Location: IWMI-HQ Call no: ICID 631.7 G000 ICI Record No: H025180)
10 Dharmasena, P. B.. 2001. Towards efficient utilization of surface and groundwater resources in food production under small tank systems. In Gunasena, H. P. M. (Ed.). Food security and small tank systems in Sri Lanka: proceedings of the workshop organized by the Working Committee on Agricultural Science and Forestry, 9 September 2000. Colombo, Sri Lanka: National Science Foundation (NSF). pp.103-110.
Tanks ; Water resources ; Siltation ; Water loss ; Catchment areas ; Rehabilitation ; Water storage ; Groundwater ; Aquifers ; Wells ; Pumping ; Surface water ; Water use / Sri Lanka
(Location: IWMI-HQ Call no: 631.7 G744 GUN Record No: H029719)
11 Dharmasena, P. B.. 2002. Micro-scale irrigation systems. Economic Review, 28(2-5):39-40, 46.
(Location: IWMI-HQ Call no: PER Record No: H032073)
12 Dharmasena, P. B.. 2003. Integrated management of surface and groundwater resources in tank cascade systems. In Pathmarajah, S. (Ed.), Use of groundwater for agriculture in Sri Lanka: Proceedings of a symposium. Peradeniya, Sri Lanka: Agricultural Engineering Society of Sri Lanka (AESSL); University of Peradeniya. Faculty of Agriculture. Department of Agricultural Engineering. pp.53-65.
(Location: IWMI-HQ Call no: 631.7.6.3 G744 PAT Record No: H034610)
13 Dharmasena, P. B.. 2004. Small tank heritage and current problems. In Aheeyar, M. M. M. (Ed.), Small tank settlements in Sri Lanka: Proceedings of a symposium, 21 August 2004. Colombo, Sri Lanka: HARTI. pp.31-39.
(Location: IWMI-HQ Call no: 631.7.1 G744 AHE Record No: H036691)
14 Dharmasena, P. B.. 2004. Characteristics of regolith aquifers and their safe exploitation through agro-wells. Annals of the Sri Lanka Department of Agriculture, 6:79-87.
Wells ; Aquifers ; Hydrology ; Models ; Pumping ; Irrigated farming / Sri Lanka / Bakamuna / Galmulla Village
(Location: IWMI-HQ Call no: P 7636 Record No: H039352)
15 Dharmasena, P. B.; Ranaweera Banda, R. M. 2004. Guidelines for extension workers to determine location-suitability for agro-wells. Annals of the Sri Lanka Department of Agriculture, 6:89-97.
(Location: IWMI-HQ Call no: P 7636 Record No: H039353)
16 Dharmasena, P. B.; Nijamudeen, M. S.; Ranaweera Banda, R. M.; Gunawardena, G. 2002. Farmer participatory approach for enhancement of productivity in minor-tank low-lands. Annals of the Sri Lanka Department of Agriculture, 4:65-72.
Water shortage ; Irrigation water ; Tanks ; Crops ; Diversification ; Water budget ; Drainage / Sri Lanka / Periyakulama / Kasamaduwa
(Location: IWMI-HQ Call no: P 7639 Record No: H039361)
17 Nijamudeen, M. S.; Dharmasena, P. B.. 2002. Performance of chilli under drip-irrigation with mulch. Annals of the Sri Lanka Department of Agriculture, 4:89-94.
(Location: IWMI-HQ Call no: P 7639 Record No: H039363)
18 Dharmasena, P. B.; Nijamudeen, M. S.; Peiris, K. H. S. 2001. Growth performance of mango and lime with in-situ rainwater harvesting. Annals of the Sri Lanka Department of Agriculture, 3:27-36.
Water harvesting ; Arid zones ; Pitcher irrigation ; Soil moisture ; Fruits ; Mangoes ; Lime ; Citrus fruits / Sri Lanka
(Location: IWMI-HQ Call no: P 7671 Record No: H039435)
19 Dharmasena, P. B.. 2010. Agriculture, environment and food security in the context of rice. In Weligamage, Parakrama; Godaliyadda, G. G. A.; Jinapala, K. (Eds.). Proceedings of the National Conference on Water, Food Security and Climate Change in Sri Lanka, BMICH, Colombo, Sri Lanka, 9- 11 June 2009. Vol. 1. Irrigation for food security. Colombo, Sri Lanka: International Water Management Institute (IWMI). pp.47-56.
(Location: IWMI HQ Call no: IWMI 631.7 G744 WEL Record No: H042893)
Agriculture requires inputs, which can be found within the system or need to be supplied from outside. The latter, referred to as the ‘Green Revolution’ in the 1950s and developed as the high external input agriculture, has spread over the world as a solution to the food crisis that arose due to World War II. The drive embraced a special package including high- yielding crop varieties, inorganic fertilizer, agro- chemicals and farm machineries. As a result, farmers in many developing countries began to practice mono-cropping with high external inputs. This has turned traditional ecological agriculture into environmentally destructive food production systems, which provided huge amounts of produce causing serious environmental damage. During the ‘Green Revolution’ traditional crop varieties were replaced by high-yielding new improved varieties, which had higher yield potential. However, natural pest resistance of these high-yielding varieties was generally poor, while nutritive requirements were high. Increased use of pesticides and chemical fertilizer is a matter of concern. Some of the issues and problems due to indiscriminate use of pesticides are: a) pest resistance; b) pest resurgence; c) health hazards; d) environmental pollution; and e) lower profits to farmers. Extensive use of chemical fertilizer has created environment issues such as nitrate leaching, release of greenhouse gases and eutrophication of inland water bodies. Millennium development goals earmark the eradication of extreme poverty and hunger, while ensuring environmental sustainability. This dispels the concept of achieving food security in any country through the adoption of high external input agriculture. Sri Lanka remains vulnerable to natural disasters such as floods, droughts, cyclones, landslides, epidemics etc., causing substantial threats to the food security situation of the country. Challenges posed by external factors due to globalization and open- economic policies have directed the country’s agriculture to move away from self- reliance. This situation demands a firm and perfect policy for the country’s agriculture. Furthermore, present agriculture does not show any indication of sustainability as it has ignored the centuries-old wisdom of traditional agriculture. Farmers’ dependency mentality evolved due to modern agriculture and government policies, which dealt with agriculture from time to time. This should be gradually replaced by developing farmers’ self- confidence, selfmotivation and empowerment. There is a great potential to increase productivity in Sri Lanka as only 40 % of the average potential for grain yield was achieved in different ecological and hydrological regimes. By narrowing this gap between actual and potential yield, Sri Lanka will not only increase productivity but also increase the competitive advantage for rice with other countries in the region. The experiences of the present productivity improvement program of the Department of Agriculture (DOA) have clearly shown that the average yield could be increased. In achieving food security in the country, a major set back in the development process is that institutional linkage among agencies responsible for water, land, agriculture and environment is very weak, and they work in isolation, setting their own targets. The need is felt for the immediate formulation of a firm policy to implement a sustainable agricultural production program in the country in order to ensure the food security in Sri Lanka.
20 Dharmasena, P. B.. 1992. Magnitude of sedimentation in village tanks. Tropical Agriculturist, 148:97-110.
Tanks ; Villages ; Sedimentation ; Surveys ; Catchment areas ; Soils ; Erosion / Sri Lanka / Anuradhapura District / Maha Kanumulla / Paindikulama Tank / Siwalagala tank / Marikaragama Tank
(Location: IWMI HQ Call no: e-copy only Record No: H044312)
(0.42 MB)
A sedimentation study was carried out in three village tanks in the Maha Kanumulla small watershed (Anuradhapura district). The amount and rate of sedimentation were determined by using field engineering and soil surveys. The results showed that the total volume of sediment collected in these tanks ranged from 23 to 35% of the tank potential storage. The rate of sedimentation was found to be higher in recent past compared to ' the average rate of sedimentation during the total past life of the tank. The present rate of sediment yieldis about 3200 and 6000m,/km2/yr from Marikaragama and Paindikulama tank catchments respectively. Thus, the tank life index could be estimated at 35 years - and 150 years for the respective village tanks. The information gathered from the study indicate that not only the village tank but also the tank catchment is affected by this erosion process as far as the agricultural use of land is concerned. Storage capacity of these village tanks is decreasing at the same rate that the sediment is collected, causing a gradual reduction in the cultivable extent of their command areas.
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