Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/6317
Authors: Rai, Amaresh Kumar
Issue Date: 1994
Abstract: Irrigation scheduling is one of the major problems needing attention by farmers and'water management engineers. The ■ timing of irrigation has a significant effect on the yield of crops. A sound irrigation management requires information of root water uptake patterns of different crops, rate of potential evapotranspiration for different crops, soil water retention characteristics and scheduling criteria while deciding irrigation timing for a crop. In the present study, model of root extraction is proposed, in which all possible variations of extraction rate with depth are considered. Five crops are chosen for simulation studies of the model,and soil moisture depletion under optimal conditions is calculated from different layers for each crop. Rooting depth is assumed to vary with the potential evapotranspiration for each crop during the vegetative phase. The calculated depletion patterns are compared with measured mean depletion patterns for each crop. It is shown that the proposed root water uptake model can be used to simulate, various root water uptake patterns and these can be used for the prediction of soil moisture depletion. In the case of sub optimal condition, this model also works satisfactorily. Using this model, the scheduling of irrigation is illustrated for different crops and soil characteristics. Thus, the proposed model can be used advantageously for irrigation management purposes.
Other Identifiers: M.Tech
Research Supervisor/ Guide: Ojha, C. S. P.
metadata.dc.type: M.Tech Dessertation
Appears in Collections:MASTERS' DISSERTATIONS (Civil Engg)

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