Irrigation plays a crucial role in horticulture by supplying the necessary water that plants need to thrive, especially during periods of drought. When natural rainfall is insufficient, irrigation ensures that crops receive a consistent and adequate water supply, promoting healthy growth and maximizing yield. This is vital for maintaining soil moisture levels, which is essential for flower and fruit development, root establishment, and overall plant health.
While there are benefits to soil temperature regulation and some indirect impacts on diseases due to consistent moisture levels, those are not the primary positive impacts directly associated with irrigation. Similarly, while irrigation can support nutrient availability, it does not eliminate the need for fertilizers; plants still require essential nutrients that may not be sufficiently supplied through irrigation alone. Thus, providing necessary water during drought conditions is the most significant and direct positive impact of irrigation in horticulture.