Which of the following is not a main purpose of temporary irrigation systems?

Temporary irrigation systems are primarily designed to provide water to crops during critical growth periods, support erosion control, and help manage dust in agricultural settings.

Establishing growth is a vital role of temporary irrigation, as it ensures that plants receive adequate moisture to thrive, particularly during the initial stages of development. Erosion control is another significant purpose, as properly managed irrigation can stabilize soil and reduce the risk of erosion. Furthermore, controlling dust is essential for maintaining air quality and preventing problems associated with airborne particles, especially in dry areas or during tillage operations.

Water heating, however, is not a main purpose of temporary irrigation systems. While there are irrigation methods that can indirectly lead to warmer soil or water, the primary mission of temporary systems lies in directly addressing moisture needs for crops, managing erosion, and controlling dust. Thus, focusing on planting health and ecological stability explains the rationale behind why water heating is not a central function of these systems.