Carbon footprint of rice (Oryza sativa L.) from production to post production in Laguna, the Philippines

Date

7-2015

Abstract

This study was conducted from May 2014 to April 2015 in cooperation with the Green Super Rice (GSR) Project of IRRI in seventy seven (77) farms growing GSR and NON GSR rice in seven villages in Laguna. The net carbon footprint from unmilled rice in the dry and wet season from production-to-production in hectare and ton basis was estimaicd al 15192.07 kg CO2 ha-1 or 2462.44 kg CO2 ton-1 (2.46 kg CO2 per kilogram rice. Carbon footprint at production was 12298.27 kg CO2 ha-1 (81% of total) and at post-production 2893.8 kg CO2 ha-1 (19% of total). Contributing to this total were soil cmission at 70.4%, cropping 8,42%, N fertilizer 4,73%), coking 12.05%, transportation 5.36% and burning o straw 3.13%. The social cost of carbon (SCC) per hectare was estimated at PhP 15055. The average SCC per ton of rice was estimated at Php 2438 (PhP 2.44/kg). The SCC values were PhP 2130 for GSR8, PhP 2408 for GSR2, PhP 2477 for SL9 and SL7, and PhP 2884 for RC11, RC18 and RC216.

Increasing the yield per unit area decreased the carbon footprint per ton. The carbon footprints of GSR8 ond GSR2 were 35.6% and 20%, respectively, lower than other varieties. Measures to decrease the carbon footprints include as :a) Doing mid-season drainage could decrease CH4 emissions up to 48%; b) Removing rice straws from rice fields could decrease the organic matter for anaerobic decomposition in the soil; c) distributing methane oxidation bacteria into the field to reduce CH4 and O2 to CO2 in both catabolic and anabolic pathways, and d) Incorporating nitrogen fixing legumes (Sesbania punicea and azolla anabaena) could decrease chemical N fertilizer application.

Document Type

Dissertation

Degree

Doctor of Philosophy in Agronomy

College

Graduate School (GS)

Adviser/Committee Chair

Teodoro C. Mendoza

Committee Member

Pompe C. Sta. Cruz, Edna A. Aguilar, Jauhar Ali, Antonio G. Lalusin

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 996 2015 A42 T34

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