In its pure form, chromium is a steel-gray, lustrous hard metal that has a high polish. It has many compounds that are all colored. [See Periodic Table of the Elements] Of the compounds, the most important are the chromates of sodium and potassium; the dichromates; and potassium and ammonium chrome alums.
Raising pH The ideal pH range for soil is from 6.0 to 6.5 because most plant nutrients are in their most available state. Ifa soil test indicates a pH below 6.5, the usual recommendation is for the application of ground limestone. Inaddition to having the ability to raise pH, limestone contains calcium. Lowering pH Some soils are alkaline and have a pH above 6.5. Some fertilizers (ammonium sulfate, urea, and ammoniumnitrate) create an acid reaction in the soil, so they aid in lowering or maintaining a specific pH.
The more clay and organic content in your soil, the more lime you will need to correct the pH. Sandy soils require less lime to raise pH. If you need to add more than 40-pounds of lime per 1,000-square feet to correct your pH, do it in two or more applications.f your soil test shows that the soil pH is low, add lime according to the test recommendations. If you did your own pH test, see the table to determine how much lime to apply. If you are unsure of your test results, be conservative. Too much of an amendment can be detrimental to your lawn.