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Indian Journal of Dryland Agricultural Research and Development
Year : 2010, Volume : 25, Issue : 1
First page : ( 31) Last page : ( 35)
Print ISSN : 0971-2062.

Economic Size of Water Harvesting Structures in High Rainfall Areas-An Optimization Approach

Bora Pradip K*Associate Professor, Kurmi K., Barua N. G., Karmakar R.M.

All India Coordinated Research Project for Dryland Agriculture Assam Agricultural University, Jorhat- 13, Assam

*School of Natural Resource Management, College of Post Graduate Studies, Central Agricultural University, Umiam, Meghalaya, 793 103. E-mail: pradip66@gmail.com

Abstract

Rainwater harvesting structures with supplementary irrigation increases the productivity of rabi crops which otherwise perform dismally under rainfed situation. In high rainfall areas, the size of water harvesting structures can not be determined on the basis of runoff yield from the catchment. Therefore, an optimization analysis was carried out with the help of net benefit from the definite set of crops i.e. potato, rajmah, wheat and rapeseed-mustard cultivated under different water management regimes for determining the size of water harvesting structures. The study indicated that the net benefit can be increased by providing one irrigation to the crops at their critical stages. The highest net benefit (Rs.38,200/ha) was obtained by growing irrigated rajmah at 100% area with one supplementary irrigation from a water harvesting structure having 950 m3 water spread over 5% area. The next profitable scenario was to cultivate at least 50% of irrigated potato and 25% irrigated rajmah. Rainfed rajmah (25%) was another crop picked up for higher net benefit. In this scenario, the net benefit was found to be Rs.25, 914/ha with a water spread area of 3.8% (712.5 m3). In the third scenario, where irrigated potato (40%), irrigated rajmah (25%), rainfed rajmah (25%) and rapeseed-mustard (10%) were cultivated, the net profit was Rs.24, 441/ha. The water spread area of the pond was 3.2% having total water volume of 617.5 m3.

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Key Words

Water harvesting structures, high rainfall region, Assam.

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