Question

Due to their extensive rice cultivation, some regions may be contributing to global warming. To what possible reason/reasons is this attributable ? 

1. The anaerobic conditions associated with rice cultivation cause the emission of methane. 

2. When nitrogen based fertilizers are used, nitrous oxide is emitted from the cultivated soil. 

Which of the statements given above is / are correct? 

(a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2

Answer 1

(c) Methane and nitrous oxide are the two green house gases emitted from rice field. In rice field, the flooding a field cuts off the oxygen supply from atmosphere resulting anaerobic condition which emittes methane and nitrogen fertilizer which generally used in rice field for high production, emits nitrous oxide by the reaction with atmospheric oxygen.