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Water 2014, 6(9), 2830-2846; doi:10.3390/w6092830

Improving Irrigated Lowland Rice Water Use Efficiency under Saturated Soil Culture for Adoption in Tropical Climate Conditions

1
Department of Tropical Agriculture and International Cooperation, National Pintung University of Science and Technology, Pingtung 91201, Taiwan
2
Department of Civil Engineering, National Pintung University of Science and Technology, Pingtung 91201, Taiwan
*
Author to whom correspondence should be addressed.
Received: 8 May 2014 / Revised: 15 August 2014 / Accepted: 4 September 2014 / Published: 25 September 2014
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Abstract

: Saturated soil culture is one of the water saving techniques that can improve water productivity. However, it is either less implemented or adopted because it consumes more time and energy. Therefore, an experiment was conducted to determine the effective water depth that can keep soil moisture close to saturation for a commonly practiced irrigation interval, combined with a rainfall pattern for increasing water productivity. The design was a randomized complete block with three replications and four water treatments representing 120% (T120), 180% (T180), 240% (T240), and 300% (T300) of soil saturation or the application of 2, 3, 4 and 5 cm water depth. The results showed that the application of 3 cm was the effective depth. It decreased plant height, tiller number, chlorophyll content, and panicle number per hill by 12.37%, 20.84%, 7.59%, and 70.98%, respectively. The decrease of these parameters is followed by total recovery due to effective rainfall contribution, which led to low yield sacrifice (6% of reduction) and 40% of water saving. We argue that weekly application of a 3 cm water depth and matching crop needed-water period with the onset of rainfall may be implemented and recommended as suitable saturated soil culture practice for rice production in high water demand conditions. View Full-Text
Keywords: saturated soil culture; lowland rice yield; water productivity; tropical climate saturated soil culture; lowland rice yield; water productivity; tropical climate
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Kima, A.S.; Chung, W.G.; Wang, Y.-M. Improving Irrigated Lowland Rice Water Use Efficiency under Saturated Soil Culture for Adoption in Tropical Climate Conditions. Water 2014, 6, 2830-2846.

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