In addition to crop removal, small amounts of magnesium are made unavailable to the crop each year, particularly in sandy soils. Magnesium is a very important element of plant nutrition. Its most important role is as part of chlorophyll, the green coloring matter of plants. Since chlorophyll is the basis for the whole process of photosynthesis, it's easy to see why this element plays such fundamental role in the life of green plants. But magnesium performs many other functions in plant growth.
Magnesium improves phosphorus uptake.
Magnesium is necessary for proper enzyme action. Magnesium aids in the formation of carbohydrates, proteins and fats. Magnesium promotes vitamin formation. Plants supplied with sufficient magnesium withstand spray, frost and drought damage better. Magnesium helps prevent pre-harvest leaf and fruit drop.