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.
Plants need specific types of soil to grow properly. When you have acidic soil and you need an alkaline or neutral soil, adding lime reduces the total acidity. However, you first need to know how the current level of acidity in the soil.By taking a test sample, you can find the soil's pH level.When tested, if the pH falls below 7, the soil is acidic, anything above 7 begins to become alkaline. Lime adds calcium and magnesium to the soil and counteracts the negative effects of a low pH.y taking a test sample, you can find the soil's pH level. When tested, if the pH falls below 7, the soil is acidic, anything above 7 begins to become alkaline. Lime adds calcium and magnesium to the soil and counteracts the negative effects of a low pH.