Irrigation is the process of providing water to crops through artificial means. It is an essential component of agriculture, especially in areas where rainfall is insufficient or irregular. The main reason why farmers are able to grow two or three crops in a year is due to a well-developed system of irrigation. Let's understand this in detail.

Importance of Irrigation in Agriculture:
Irrigation is crucial for agriculture because it helps in:

1. Providing Water: Irrigation helps in providing water to crops, which is essential for their growth and development. With irrigation, farmers can grow crops even in areas with low rainfall or drought-prone regions.

2. Enhancing Crop Yield: Adequate water supply through irrigation helps in enhancing crop yield. Irrigation ensures that crops receive a sufficient amount of water, which is needed for their growth, and prevents the water stress that crops may face due to inadequate rainfall.

3. Crop Diversification: With irrigation, farmers can grow a variety of crops throughout the year. This diversification of crops ensures that farmers have a steady income throughout the year and reduces their dependence on a single crop.

4. Soil Fertility: Irrigation can help in maintaining soil fertility by preventing soil erosion and leaching of essential nutrients from the soil.

Well-developed System of Irrigation:
A well-developed system of irrigation is essential for growing two or three crops in a year. It involves the following:

1. Availability of Water: A reliable source of water is essential for irrigation. This can be achieved through the construction of dams, reservoirs, and canals that can store and distribute water to fields.

2. Proper Distribution of Water: The water needs to be distributed evenly to the crops. This can be achieved through the use of sprinklers, drip irrigation, or furrow irrigation.

3. Efficient Use of Water: Efficient use of water is essential for sustainable agriculture. This can be achieved through the use of water-saving technologies like mulching, crop rotation, and use of drought-resistant crops.

Conclusion:
In conclusion, a well-developed system of irrigation is essential for agriculture. It helps in providing water to crops, enhancing crop yield, and maintaining soil fertility. With irrigation, farmers can grow two or three crops in a year, which ensures a steady income throughout the year.