Assessment of the relationship between adoption of a knowledge-intensive water-saving technique and irrigation conditions in the Mekong Delta of Vietnam
Assessment of the relationship between adoption of a knowledge-intensive water-saving technique and irrigation conditions in the Mekong Delta of Vietnam
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DOI：
10.1016/j.agwat.2018.08.041
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发表时间：
2019-02
影响因子：
6.7
通讯作者：
Takayoshi Yamaguchi;Lưu Minh Tuấn;Kazunori Minamikawa;S. Yokoyama
中科院分区：
文献类型：
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作者：
Takayoshi Yamaguchi;Lưu Minh Tuấn;Kazunori Minamikawa;S. Yokoyama
干湿交替（AWD）是一种为水稻种植节水而开发的灌溉技术。我们调查了越南湄公河三角洲地区安江省当地水稻灌溉条件如何影响农民采用 AWD。为此，我们使用了2009-2010年、2011-2012年、2013-2014年和2014-2015年旱季收集的社区层面统计数据。我们重点关注水稻海拔、渠道网络密度和三熟程度作为灌溉条件的指标。我们对 AWD 采用率与这些灌溉条件以及其他几个相关因素之间进行了部分排序相关系数分析。水稻海拔和基础设施状况引起的灌溉条件变化被认为影响 AWD 的实施。尽管 AWD 是一种优化水稻种植浇水量和时间的知识密集型实践，并且不需要额外的基础设施或机械，但它确实需要安排良好的灌溉条件。此外，在降雨量少的一年中，渠道网络在采用 AWD 中的重要性得到了强调，这表明农民更喜欢持续的洪水而不是 AWD 作为对冲水资源短缺的手段。在 AWD 中，从水稻生理学的角度来看，持续淹没被认为是一种水的浪费；然而，在灌溉条件不太理想的地方，持续的洪水就包括水库的作用。因此，AWD普及的前提条件需要重新考虑。
Alternate wetting and drying (AWD) is an irrigation technique developed to save water in paddy rice farming. We investigated how local paddy irrigation conditions affected the adoption of AWD by farmers in An Giang province of the Mekong River Delta region, Vietnam. To this end, we used community-level statistics collected in the dry seasons of 2009–2010, 2011–2012, 2013–2014, and 2014–2015. We focused on paddy elevation, density of channel networks, and degree of triple-cropping as indicators of irrigation conditions. We performed a partial rank order correlation coefficient analysis between AWD adoption rates and these irrigation conditions and several other related factors. Variations in irrigation conditions caused by paddy elevation and infrastructure status were identified as affecting AWD implementation. Although AWD is a knowledge-intensive practice for optimizing watering amounts and timing in paddy rice farming, and requires no extra infrastructure or machinery, it does require well-arranged irrigation conditions. Moreover, the significance of the channel network in AWD adoption was emphasized in a year with low rainfall, indicating that farmers prefer continuous flooding to AWD as a hedge against water shortages. In AWD, continuous flooding is considered a waste of water from the viewpoint of rice plant physiology; however, where irrigation conditions are less than ideal, continuous flooding includes the role of water reservoirs. Therefore, the prerequisite conditions for diffusion of AWD need to be reconsidered.