TCEQ Irrigation Practice Exam 2025 - Free Irrigation License Practice Questions and Study Guide

The typical duration for irrigation in sandy soils is 15-20 minutes per session. Sandy soils have larger particle sizes and lower water retention capacity compared to clay or loamy soils. This means water drains quickly through sandy soils, necessitating more frequent irrigation sessions to ensure adequate moisture without over-saturating the ground.

Irrigating for 15-20 minutes strikes a balance between allowing enough time for water to infiltrate and be absorbed by the roots, while also preventing excess runoff. This time frame helps maintain soil moisture without wasting water, aligning with efficient irrigation practices that are especially important in regions where water resources may be limited.

In contrast, shorter durations may not provide sufficient moisture, leading to inadequate plant hydration, while longer durations may cause runoff or leaching, where vital nutrients are washed away from the plant root zone. Thus, the 15-20 minute irrigation session is well-suited for sandy soils, ensuring optimal conditions for plant growth.