EFFECTS OF WATER MANAGEMENT AND SOIL TYPE ON GREENHOUSE GASES EMISSION FROM RICE PRODUCTION IN AN GIANG PROVINCE

Abstract

Mekong delta has been well known for rice production of Vietnam and had great contribution of rice export of Vietnam and for acid sulfate and alluvial soils. Greenhouse gases emission from rice has been raised for its contribution to global warming. The technique of alternate wetting and drying (AWD) has been recommended used for reduction of greenhouse gases. An experiment was set up with 3 factors of water management (AWD and CF-continuous flooding), soil type (acid sulfate and alluvial soil) and seasonal effect (Spring Summer, Summer Autumn and Winter Spring) for collecting emission of CH4, N2O and rice yield. The CH4emission was less in the AWD 2.76 mgCH4.m-2.h-1than in the CF 4.66 mgCH4.m-2.h-1(p<0.05). Also, the rice yield was 5.87 ton.ha-1.season-1for AWD and higher than 4.80 ton.ha-1.season-1for CF (p<0.05). The soil type did not affect the greenhouse gases emission and the rice yield. The N2O emission was very low and variation. The AWD should be applied broadly to all the area of rice production in the Mekong delta due to its less greenhouse gases emission.