Consider the following agricultural practices:1. Contour bunding2. Relay cropping3. Zero tillage In the context of global climate change, which of the above helps/ help in carbon sequestration/storage in the soil?
✓ Correct answer: b) 3 only
ExplanationTerrestrial Carbon sequestration is the process through which carbon dioxide from the atmosphere is absorbed by trees and plants through photosynthesis and stored as carbon in soil and biomass.Option 3 is correct: Zero Tillage is the process where the crop seed will be sown through drillers without prior land prepara- tion and distributed in the soil where previous crop stubbles are present.Zero tillage not only reduces the cost of cultivation it also reduces the soil erosion, crop duration, irrigation require- ment and weed effect which is better than tillage.Zero tillage is environmentally safe because it helps in reducing greenhouse effect through carbon sequestration.Options 1 and 2 are incorrect:Contour bundling involves the construction of banks along the contours.Terracing and contour bunding divide the hill slope into numerous small slopes, check the flow of water, promote absorption of water by soil and save soil from erosion.Retaining walls of terraces control the flow of water and help in reducing soil erosion.Relay Cropping is the process of growing one crop,
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