Write a note on the various methods used to replenish the nutrients in the fields.

Explanation

### Step-by-Step Solution:

1. **Chemical Fertilizers**:
- Chemical fertilizers are inorganic salts that are added to the soil to increase its nutrient content. They primarily provide essential nutrients like nitrogen, phosphorus, and potassium, which are crucial for plant growth. These fertilizers are manufactured and can be applied in specific quantities to meet the nutrient requirements of crops.

2. **Organic Manure**:
- Organic manure is derived from natural sources, such as animal excreta (like cow dung) and decomposed plant material. Unlike chemical fertilizers, manure improves soil structure, enhances microbial activity, and adds organic matter to the soil, which helps retain moisture and nutrients. This method is sustainable and beneficial for long-term soil health.

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