Prelims 2012 · Environment · Question 98
Consider the following agricultural practices:
- Contour bunding
- Relay cropping
- Zero tillage
In the context of global climate change, which of the above helps/help in carbon sequestration/storage in the soil?
Answer
1, 2 and 3
1. Contour bunding — It reduces runoff and soil erosion, conserves moisture, and helps retain organic matter/topsoil; this supports greater soil carbon storage. Verdict: Correct.
2. Relay cropping — Growing another crop before the first is harvested keeps the soil covered longer and adds more root biomass/residues, which can increase soil organic carbon. Verdict: Correct.
3. Zero tillage — Minimal soil disturbance reduces oxidation of soil organic matter and helps build soil carbon over time. Verdict: Correct.
Hence, all three practices help in carbon sequestration/storage in soil.