Natural Resource Management and Sustainable Agriculture
What this domain tests
Natural Resource Management and Sustainable Agriculture tests land, water, biodiversity and soil conservation, watershed management, conservation agriculture, organic farming, crop residue management and agroforestry. The focus is on maintaining productivity without depleting the resource base.
Core rules and concepts
- Natural resources are finite; management aims at use that keeps renewal capacity intact.
- Soil erosion by water begins with raindrop impact and continues as sheet, rill and gully erosion. Contour bunds, terraces and vegetative barriers reduce it.
- Watershed management treats a drainage area as a unit for soil and water conservation.
- Conservation agriculture uses minimum soil disturbance, permanent soil cover and crop rotation.
- Organic farming relies on organic inputs, biological pest control and crop rotation; certification requires documented compliance.
- Crop residue should be recycled or retained, not burned; burning loses carbon and nutrients and causes air pollution.
Worked example
A field of 1 ha needs 5 cm of irrigation depth. Volume = 10,000 m² × 0.05 m = 500 m³. If application efficiency is 70%, water to be released = 500 ÷ 0.70 = 714 m³. The reasoning is to convert depth to metres, multiply by area to get stored volume, then divide by efficiency to find the larger amount that must be supplied.
Traps that cost marks
Do not confuse gross irrigation requirement with net requirement. Do not treat organic farming as automatically higher-yielding. Do not recommend burning as residue management. Do not confuse a watershed with a single farm pond. Do not ignore the difference between rainfed and irrigated planning.