The best irrigation method depends on factors such as crop type, soil, climate, and water availability. Drip irrigation is best for areas with limited water and shallow-rooted crops. Sprinkler irrigation suits large fields with high water crops. Flood irrigation is ideal for water-loving crops, while center pivot is best for flat terrain and high water availability. Subsurface irrigation suits areas with limited water and deep-rooted crops. The choice of irrigation method should consider the crop needs and local conditions.

Irrigation is necessary to provide crops with the required amount of water to grow and thrive. It is essential in areas with low rainfall or where the climate does not provide sufficient moisture for crops to grow. Irrigation helps farmers to control the timing and amount of water applied to their crops, which can improve crop yields and quality. Additionally, irrigation can also be used to leach salts from the soil, which can improve soil fertility and reduce soil salinity.

Irrigation is necessary in areas where there is insufficient natural water supply to meet the water requirements of crops. This can include regions with low rainfall or where the climate is arid or semi-arid. Irrigation can also be necessary in areas where the water quality is poor, such as regions with high soil salinity. In general, irrigation is essential in agriculture to ensure the availability of sufficient water to support crop growth and development, regardless of the specific geographic location.

Irrigation is essential in India because the country relies on monsoon rains, faces water scarcity, and frequent droughts. Irrigation helps conserve water, increase crop yields, ensure food security, and create jobs in rural areas.