|
 |
 |
|
Fall Takes: The crayfish has two divisions to the body —cephalothorax and segmented abdomen.
Mating takes place during early spring or fall takes, depending upon geographical location. Eggs are laid several weeks to several months after mating, depending upon the season.
Crayfish do not possess poison. They use their pincers in self-defense.
The grasses adaptable for the North fall takes into five groups, bluegrasses, fescues, bents, Zoysia japonica and a mixed group of non-permanent grasses. We shall consider these and various mixtures of them. In addition clover is sometimes used.
Kentucky bluegrass is the most important lawn grass in the cooler, humid regions. Where summers are not excessively long and hot it forms a dense turf of high quality and pleasing green. It spreads by short, creeping, underground stems and stands wear well. Injury to its surface heals quickly.
A fertile reasonably moist, slightly acid or neutral soil is needed. It will not stand shade.
Kentucky bluegrass is raised from seeds. These germinate much better in fall takes than spring. A fair sowing rate is two to four pounds to 1,000 square feet. The seedlings are rather slow starting. It takes a year or more before a really good sod is established. Best growth is made in spring and fall takes. In hot weather this grass goes partly dormant, an unfortunate feature •which, if the sod is at all sparse, gives crab grass a great opportunity. Kentucky bluegrass grows well in mixture with other grasses. Mowing height should be not less than one and a quarter to one and a half inches.
This is because the amount of friction that a train wheel must overcome is relatively small. The actual surface contact of a steel wheel with a steel rail is only about the size of an American dime. It takes about 7.5 times as much force to move a comparably loaded rubber-tired vehicle on a highway as it takes to move a steel-wheeled railroad car on a steel rail. It takes four times as much force to move a hull in water. |
|
|
| |
|
|
|
|
