TITLE:
Effect of Nitrogen and Water Management on Methane Emission of Boro Rice Cultivation in Bangladesh
AUTHORS:
Israt Zahan, Shahadat Hossen, Akhter Hossain Chowdhury, Abdul Baten
KEYWORDS:
Methane, Urea Super Granule, Prilled Urea, Alternate Wetting and Drying, Boro Rice
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.6 No.7,
July
27,
2018
ABSTRACT: Water and nitrogen are two key elements required for successful rice cultivation.
We examined the responses of nitrogen and water management on methane
emission of Boro rice in the field laboratory of Bangladesh Agricultural
University research farm, Mymensingh. Three treatments were studied in the
field experiment viz, T1: Control plot (no nitrogen fertilizer), T2: Urea super
granule (78 kg N/ha), T3: Prilled urea (104 kg N/ha) with three replications under
two water management of Continuous Standing Water (CSW) and Alternate
Wetting and Drying (AWD). Air samples were collected by the
closed-chamber method and methane gas was determined by gas chromatography.
The highest CH4 emission was found from CSW plots and the lowest
from AWD plots. Under CSW condition, the effects of urea treatments on
CH4 emission were not significant. In case of urea treatments, the highest CH4
emission was observed from treatment T3 under CSW condition and T2 under
AWD condition and the lowest emission was from the control treatment.
The overall results suggest that prilled urea and urea super granule should be
applied under AWD and CSW condition, respectively to keep less CH4 emission
from irrigated rice agriculture.