1. Irrigation maintains moisture in the soil. Moisture is necessary for the germination of seeds. Seeds do not grow in dry soil. That is why irrigation is done before tilling.
2. Irrigation is essential for the growth of the roots of the crop plants. Roots of the plants do not grow well in dry soil.
3. Irrigation is necessary for the absorption of mineral nutrients by the plants from the soil. Thus, irrigation is essential for the general growth of the plants.
4. Water supplies two essential elements hydrogen and oxygen to the crop.