1. A sod farmer in the Chicago area had a large acreage of Merion bluegrass to be sold as sod. The seed was contaminated with smooth bromegrass; hence the sod could not be certified. The owner asked for a mowing schedule which would destroy the brome but save the bluegrass.

2. Most of the grass that remained after the "Dust Bowl" of the 30's was buffalo grass and blue grama. The bluestems, Indiangrass, stipa species and side-oats grama disappeared. Why?

3. Orchardgrass is well fertilized and irrigated. After being harvested with a low set cutter bar, in August after a 7 weeks recovery growth, there was a complete loss of orchardgrass. Orchardgrass harvested with a higher cutter bar on the same date with 3-5 weeks recovery showed no stand reduction. Explain the management implications.

4. A large number of orchardgrass clones are planted 30 inch (76.2 centimeter) apart in 30 inch (76.2 centimeter) spaced rows. The clones measured 12 inches (30.5 centimeters) in diameter. All are mowed in the same manner: moving in an easterly direction such that shoots leaning toward the mower (west side of the clone) would be cut lower than those on the opposite side. Two weeks later, shoots in the west side of all the clones were completely dessicated, as were those in the center of the clone. However, shoots on the perimeter of the east side were normal, with about 6 inches (15.2 centimeters) of recovery growth. What factors are in play in this situation?