Question

Which of the following can replenish nutrients in the soil?
A. Fertilizer
B. Manure
C. Compost
D. All of the above

Answer 1

Hint: Plants need nutrients along with sunlight to germinate, grow, fight off diseases and pests and to reproduce. They obtain nutrients from soil and water.

Complete answer:
The chemical substances supplied to the crops for higher yield are called fertilizers. Farmers use fertilizers extensively to increase their field productivity. The fertilizers are rich in all the essential nutrients required by the plants such as nitrogen, potassium, and phosphorus for growth and development. They also enhance the water retention capacity of the soil thereby increasing its fertility. They also increase tolerance to pests.
The decomposed form of dead plants and animals which when applied to the soil, increases the production is termed as manure. It is a natural form of fertilizer and is cost-effective. It is highly rich in organic matter and humus and thus improving soil fertility. It aids in maintaining the pH (a measure of acidity or alkalinity) in a healthy range for crops. It significantly increases the carbon and nitrogen content of the soil.
Compost is actually what we get when organic materials (like food scraps, leaves, and animal products) decompose properly. Compost is a nutrient-rich, dirt-like material that can be used to enrich the soil and nourish growth. Compost functions by introducing both microorganisms like bacteria and fungi; and nutrients like nitrogen, copper, phosphorus, and zinc, to the soil, which makes it more fertile thus providing better yield.
We have discussed the function of each of the substances and find that all of these substances have the potential to replenish nutrients in the soil.
So, the correct answer is (d) All of the above

Note:
- Plants need 17 essential nutrients in the soil to survive and to grow.
- Composting prevents soil erosion to much extent.
- Excess use of fertilizers can cause leaching and the fertilizers can reach the rivers causing eutrophication.
- Also, fertilizers can disturb the pH when used in high amounts.