Irrigation methods are techniques used to supply water to crops and plants. Common methods include drip irrigation, where water drips directly to the roots, and sprinkler irrigation, which sprays water over the plants like rain. These methods help ensure that plants receive the right amount of water for optimal growth. Another method is surface irrigation, where water flows over the soil surface to reach the plants. Subsurface irrigation involves placing pipes below the soil to deliver water directly to the root zone. Each method has its advantages and is chosen based on factors like soil type, crop needs, and available resources.