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Innovative land and water management approaches in Asia: productivity impacts, adoption prospects and poverty outreach

There are no unanimous views regarding the real water‐saving effects of land and water management innovations. Some claim that the innovations merely change the prevailing water allocation. However, there is no dispute regarding their land and water productivity impacts. The water productivity impro...

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Published in:Irrigation and drainage 2007-04, Vol.56 (2-3), p.335-348
Main Authors: Namara, R.E, Hussain, I, Bossio, D, Verma, S
Format: Article
Language:English
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Summary:There are no unanimous views regarding the real water‐saving effects of land and water management innovations. Some claim that the innovations merely change the prevailing water allocation. However, there is no dispute regarding their land and water productivity impacts. The water productivity improvement ranged from 30% for zero tillage technology to 648% for micro‐irrigation technology for beetroot. The land productivity improvement ranged from 4% for bed planting technology to 88% for micro‐irrigation technology for watermelon. Aerobic rice varieties are inferior to lowland rice varieties in terms of land productivity but superior in water productivity. In addition, some of the innovations reduce cost of production, improve the quality of produce and entail positive environmental externalities. However, the current level of adoption of these innovations is not satisfactory due to insufficient labour and organic fertilizer availability problems, uncertain irrigation water supply, crop specificity and complexity, lack of capital, high knowledge and technical skill requirements. To realize the potential benefits of these innovations to the poor the following actions are suggested: (1) provision of subsidies; (2) targeted training opportunities; (3) encouragement of private participation in the supply chain of inputs; (4) focus on short pay‐back period technologies; (5) strengthening of public research on the systems. Copyright © 2007 John Wiley & Sons, Ltd. Les réponses possibles au problème de manque d'eau impliquent deux actions complémentaires, gestion de l'offre et gestion de la demande. Les approches innovantes de gestion des terres et de l'eau font partie des solutions de gestion de la demande. Il n'existe pas d'opinion unanime sur les véritables effets des innovations en matière d'économie d'eau. Certains disent que les innovations changent simplement la répartition de l'eau ou son mécanisme de transfert. Cependant, il n'y a aucune contestation concernant leurs impacts sur la productivité de la terre et de l'eau. Et, pour certaines des innovations qui font l'objet de cet article, ces impacts sont tout à fait substantiels. L'accroissement de productivité de l'eau va de 30% pour le zéro labour à 648% pour la micro‐irrigation de betteraves. La hausse de productivité de la terre va de 4,2% pour la culture en billons à 87,5% pour la micro‐irrigation de pastèques. Les variétés aérobies de riz sont inférieures aux variétés de riz de bas fonds en termes de
ISSN:1531-0353
1531-0361
DOI:10.1002/ird.308