Tifton 85 bermudagrass is the best grass for the Coastal bermudagrass belt. Compared with Tifton 78 in duplicate two-acre pastures fertilized annually with 225 lb/A of N in a 4-1-2 (N-P205-K20) ratio fertilizer split-applied in March, June and August, Tifton 85 produced 47% more LWG/A/yr.
vigorous action or effort: physical and mental exertion. 2. an effort: a great exertion to help others. 3. exercise, as of power or faculties.
Exercise is exertion. noun. Exertion is defined as physical or mental effort, or to the use of force or influence. Doing an extremely hard crossword puzzle that taxes your brain is an example of mental exertion.