Question

Methane gas producing field is
(A) Wheat field
(B) Paddy field
(C) Cotton field
(D) Groundnut field

Answer 1

Hint: Methane gas is produced from biomass like, standing vegetation aquatic crops, forestry and agriculture resides and animal wastes.

Complete Answer:
- Methane $\left( {C{H_4}} \right)$ is one of the major agricultural greenhouse gases. The paddy fields are one of the biggest anthropogenic sources of methane $\left( {C{H_4}} \right),$ which is the second source of anthropogenic greenhouse gas $\left( {GHG} \right).$
- In the paddy field the key of controlling methane emission lies in the control of irrigation water. The management of the rice paddy field influences the amount of $C{H_4}$and ${N_2}O$ emitted.
- When the fields are flooded, soil may trap large quantities of methane and this then escapes into the atmosphere during wet tillage, harrowing, transplanting and weeding. Methanogens are microorganisms that produce methane as a metabolic byproduct in the presence of water.
- Methanogens can be found in rice fields and emit methane in the presence of water.
Straw incorporation is a common long term practice to improve soil fertility in croplands, worldwide.
- However, straw amendments often increase methane $(C{H_4})$ emissions from rice paddies one of main sources of anthropogenic $C{H_4}$. Rice is a staple food for almost half of the people in the world. Global rice demand is projected to increase by $28\% $.
Methane emissions from rice paddies impacts $C{H_4}$ production to a large extent.

Hence, paddy field is the correct option.

Note: Compared to the single rice cultivation, double rice cultivation has a longer growing season. Hence, it needs a longer flooding environment during rice growing. That means, a large amount of methane is released in such cases.