Management and environmental constraints to rice yield within a village irrigation system — A case study from Sri Lanka |
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| Authors: | E Daléus O Palm K Sandell S N Jayawardena G D Siripala |
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| Institution: | (1) Department of Water and Environmental Studies, Linköping University, S-581 83 Linköping, Sweden;(2) Department of Agriculture, Agricultural Research Station, Maha Illuppallama, Sri Lanka |
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| Abstract: | Management and environmental constraints to rice yield in a paddy tract (lowland rice field) was studied within a village irrigation system in Sri Lanka. The relative importance of water coverage during the critical period and soil fertility variables on the yield variations were analysed. For the upper part of the paddy tract having adequate water supply, environmental and management factors seemed to explain the large variations in yield. For the middle and lower parts, with a shortage of water, water coverage was the only significant explanatory factor.For efficient use of a scarce water supply farmers allocated water first to the upper part, which resulted in water deficiency further down. An alternative strategy for water allocation, where the lower more fertile part of the paddy tract is favoured, would not avoid the risk of water scarcity for the individual farmer but there would be a potential for increase in the total production. |
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