Magnesium

Magnesium is another of those nutrients that is listed as secondary main because it is usually not deficient. Magnesium however can be deficient on soils in areas where the lime is mainly calcitic. Magnesium is at the center of the chlorophyll molecule so it is very important. Excess magnesium is a common problem in areas where most of the limestone is dolomitic. Excessive Magnesium can cause tilth problems. Excessive magnesium can balanced by adding more lime or gypsum to the soil.