Which of the following situations allows for the use of phosphate in turf management?

The use of phosphate in turf management is particularly beneficial during turf establishment. During this phase, new grasses require sufficient nutrients to develop strong root systems and grow vigorously. Phosphate plays a crucial role in root development, enhancing the grass's ability to absorb water and nutrients from the soil. When turf is being established, the application of phosphate helps to ensure that the young plants can thrive, leading to a more robust and healthy lawn over time.

While grass seeding is related to establishing turf, the specific mention of turf establishment emphasizes the critical need for nutrient support at this early growth stage. Although soil testing is essential for diagnosing nutrient needs and determining the appropriate applications, it does not directly involve the use of phosphate itself. Additionally, while phosphate could theoretically assist in weed control indirectly by promoting healthy grass, its primary role in turf management is centered on supporting the establishment of new turf.