Question

Both manures and fertilisers replenish soil fertility. Compare and contrast the advantages and disadvantages of using them. ​

Answer 1

Explanation:

→Manure adds nutrients to the soil without affecting its fertility. It does not damage the crops and produces healthy plants.

→Fertilizers are chemicals which lower the fertility of the soil if used regularly. They also damage the crops and make them unhealthy for consumption.

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Answer 2

Explanation:

Advantage of manure:

Manure contains most elements required for plant growth including N, P, potassium, and micronutrients (Manure as a Source of Crop Nutrients and Soil Amendment). However, it is manure’s organic carbon that provides its potential environmental value. Soil organic matter is considered nature’s signature of a productive soil. Organic carbon from manure provides the energy source for the active, healthy soil microbial environment that both stabilizes nutrient sources and makes those nutrients available to crops.

Disadvantage of manure:

Manure is a natural or an organic substance obtained by the decomposition of plant and animal wastes. This is done by microbes, earthworms, fungus etc. Manures are very high potential for weed seeds. Weeds can be a major problem when applying horse or cow manure. Low percentage of nutrients is present. So crop productivity is increased only to some certain extent. E. coli can be spread through manure, and outbreaks of these bacteria may occur in vegetables.

Advantage of fertilizer:

It increases crop yield and improves poor quality land.

Manure improves soil texture, recycles nitrogen and introduces essential bacteria.Pasture is improved so animals fatten up quicker.Once marshland is drained, fertilisers can help reclaim that land for pasture.Crops grow faster – particularly when hybrid seeds are used.

Disadvantages of fertilisers:

Crops grow better, but so do weeds. Therefore

herbicide sprays are required too.Better quality plants attract insects so pesticides may be needed.Excess nitrogen from fertilisers gets into water supplies,causing fish to die.Chemicals need to be used safely. In poorer countries in particular, farmers can

damage their health by applying fertilisers, pesticides and herbicides incorrectly.Artificial fertilisers, applied without organic additions, do not improve soil structure.

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