Worksheet: Stars and the H-R Diagram. Background: The Hertzsprung-Russell diagram is actually a graph that illustrates the. relationship that exists between the average surface temperature of stars and their. absolute magnitude, which is how bright they would appear to be if they were al the. same distance away.
The most important time to fertilize your lawn is in the fall to help you lawn develop a strong root system. Apply 1.5 to 2.5 pounds of nitrogen per 1,000 square feet. Use a lawn fertilizer with a higher amount of nitrogen, if your grass type is Kentucky bluegrass or perennial ryegrass, or soil is sandy, or grass clippings are not returned to the lawn. Greenview recommends applying Greenview Fairway Formula Fall Fertilizer 0 Phosphate in early September.
Murphy recommends using a postemergence herbicide to control the various winter weeds in your lawn. Select a day when the air temperature reaches 50 to 60 degrees Fahrenheit and apply a selective herbicide. Selective herbicides control some species without affecting others, he said.