MP Board · Class 9 · Science · Improvement in Food ResourcesDifferentiate between manures and fertilizers based on their origin, nutrients provided, effect on soil structure, and long-term environmental impacts.

Difference between Manures and Fertilizers

1. Origin: Manures are natural substances prepared from the decomposition of plant and animal wastes (such as cow dung, farm refuse, and green litter). Fertilizers are commercially manufactured inorganic chemicals produced in factories.
2. Nutrient Content: Manures contain organic matter (humus) and small amounts of essential nutrients in low concentrations. Fertilizers are rich in specific plant nutrients like Nitrogen, Phosphorus, and Potassium (NPK) in high concentrations.
3. Soil Structure: Manure adds humus to the soil, improving its physical structure, water-retaining capacity, and aeration. Fertilizers do not add humus to the soil and, over prolonged use, can alter soil pH and ruin soil texture.
4. Environmental Impact: Manures are eco-friendly, non-polluting, and promote soil micro-organisms. Excessive use of fertilizers can lead to water pollution (eutrophication) in nearby water bodies and degrade soil fertility over time.