Greenhouse gas emissions from rice production in the Philippines based onlife-cycle inventory analysis

Author: Elmer G. Bautista 1 and Masanori Saito 2*
Received 8 September 2014, accepted 28 December 2014.
Abstract

In the Philippines, the latest national inventory of greenhouse gas (GHG) emissions for rice production has been submitted to the UNFCCC using data of 1994. In the present study, we estimated GHG emissions from rice production in the Philippines—from seedbed preparation to harvesting and threshing—based on 2006–2007 national statistics. Because the rice production area in this country is mostly dichotomized into either irrigated or rainfed areas cultivated twice a year, we used different emission factors for the soil processes in each area. Emissions from farming activities included emissions from fertilizers, agricultural machinery manufacture, and fuel as well as emissions from water buffaloes (carabaos), a draft animal widely used among Philippine rice farmers. We estimated the total GHG emissions from rice production in the Philippines to be 13.3 Tg COeq. yr-1, which comprised 3,920 kg COeq. ha-1 crop-1 in irrigated areas and 1,381 kg COeq. ha-1 crop-1 in rainfed areas. These corresponded, respectively, to 0.93 kg COeq. kg grain-1 and 0.47 kg COeq. kg grain-1. A large proportion of the emissions was derived from soil processes such as CH4 and N2O emissions from soil. Emission from carabaos was 50 kg COeq. ha-1 irrespective of the water management regime. Emissions from fuel and other farming activities were 140 kg COeq. ha-1 crop-1 in irrigated areas and 111 kg COeq. ha-1 crop-1 in rainfed areas.

Journal: Food, Agriculture and Environment (JFAE)
Online ISSN: 1459-0263Year: 2015, Vol. 13, Issue 1, pages 139-144.Publisher: WFL.


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