Sial in geology is the upper layer of the earths crust. Because the Earth's crust behaves like a liquid, the rocks in the sial tend to be the least dense, in the same way yoâ¦u see when you float oil on water and values of 2700 to 2800 kg/m3 are typical. The rocks are rich in silicate and aluminum minerals.
Perennial ryegrass is planted as permanent turf or lawn grass and to overseed warm season grasses while they are in winter dormancy. Perennial ryegrass seed is also mixed with other cool season grasses to provide more density to the dominate grass in the mixture.
TIMOTHY Grass-Phleum pratense Timothy grass seed produces a vigorous, early maturing cool season bunchgrass. It is a short lived perennial with stems larger than most grass plants providing a coarse hay-type look.Timothy is very leafy compared to other pasture type grass.Timothy grass usually matures earlier than other grasses but about the same as clovers and alfalfa. Timothy has a shallow root system that does NOT allow it to handle drought and heat stress very well.t is a short lived perennial with stems larger than most grass plants providing a coarse hay-type look. Timothy is very leafy compared to other pasture type grass.