Question

why are chemical fertilizers used in new farming methods? how could use of fertlizers make soil less fertile? what are the alternative ways to enrich the soil?

Answer 1

Chemical fertilizers are used as

They are easy to transport and store.
They are nutrient specific and hence help in providing a specific nutrient to nutrient deficient soil

Overuse of fertilizers may change the chemical nature of the soil.

Providing manure, Practicing Field Fallow and Crop Rotation.

Hope it helps you.
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Answer 2

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1. chemical fertilizers provide minerals (nitrogen, phosphorus and potassium )which dissolve in water and are immediately available to plants.

2. but may not be retained in the soil for long.

3. they may be leached from the soil and pollute ground water, rivers and lakes.