Many ____ are not affected by plant growth regulators used on turf.
A) annual grasses
B) broadleaf weeds
C) perennial grasses
D) warm-season grasses
Question 2
For each 0.125 inch the cutting height is raised, the photosynthetic area of the grass can be increased by as much as ____ per 1,000 ft.2 of turf.
A) 3 ft.2
B) 30 ft.2
C) 300 ft.2
D) 3,000 ft.2