When determining irrigation needs, which type of turf is likely to need more nitrogen?

Irrigated turf tends to require more nitrogen because irrigation typically supports more vigorous growth and increased competition among grass plants. With sufficient water availability, grasses can exploit available nutrients more efficiently, allowing for enhanced growth rates. This often leads to a greater overall demand for nitrogen to support the lush and healthy growth of the turf.

In contrast, non-irrigated turf is subjected to environmental stresses such as drought, which can limit growth and, consequently, nitrogen uptake. As a result, these grasses generally need less nitrogen compared to their irrigated counterparts. The growing conditions in irrigated areas often lead to higher soil moisture levels, promoting more active biological processes in the soil, which can mobilize nitrogen and make it more available for plant uptake. Thus, the correct answer highlights the relationship between irrigation and the nitrogen needs of turf.