SRI PADDY GROWTH AND GHG EMISSIONS AT VARIOUS GROUNDWATER LEVELS1. (12th September 2014)

• Record Type: Journal Article
• Authors: Setiawan, Budi I.; Imansyah, Arief; Arif, Chusnul; Watanabe, Tsugihiro; Mizoguchi, Masaru; Kato, Hisaaki
• Is Part Of: Irrigation and drainage. Volume 63:Number 5(2014:Dec.)
• Page Start: 612
• Page End: 620
• Publication Date: 2014-09-12
• Subjects: Irrigation engineering -- Periodicals; Drainage -- Periodicals; Flood control -- Periodicals; Sustainable agriculture -- Periodicals; 627.52
• DOI: 10.1002/ird.1866
• Languages: English
• ISSNs: 1531-0353

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>The System of Rice Intensification (SRI) for improving rice production has been attracting worldwide attention for its relatively high yield and greater water productivity (WP). One distinctive characteristic of SRI paddy fields is maintaining groundwater level (GWL) close to the soil's surface as dynamic aerobic–anaerobic soil conditions enhance crop growth. We investigated the performance of SRI paddy rice when subjected to a gradual lowering of GWL to assess the consequences of this for yield, WP, and greenhouse gas (GHG) emissions. Intensive measurements of climate data, plant biomass, soil nutrients, and CH₄ and N₂O emissions were made in four plots with experimentally different GWLs. Statistical analysis was used to assess differences among the plots, and an artificial neural network (ANN) model was used to track and estimate CH₄ and N₂O based on measured GWL, soil pH, and soil temperature data. The results showed that a gradually decreasing GWL, as deep as 35 cm from the surface, was able to reduce GHG emissions, but it also produced lower yield and less WP, with correspondingly higher GHG per unit yield. In conclusion, maintaining GWL close to the soil surface would be the best practice for water management in the SRI paddy fields. Copyright © 2014 John Wiley &amp; Sons, Ltd.</p> </abstract>