There was no nitrogen analysis performed on my soil sample, yet nitrogen was recommended in 2 of the 3 fertilizer recommendations. The lawn is less than 10 feet from the shoreline and do not want to add any additional nutrients to the lake. Nitrogen is a nutrient. Why is it not assessed and why is it recommended when it has not been determined the current level in my soil?
Antrim County Michigan
Nitrogen is water soluble. The amount in the soil changes with every rainfall or watering so a standard amount is set for various crops and soil types. Phosphorus and potassium are not water soluble and move very slowly through the soil... about one or two inches a year. Because of this, they are measured differently. The biggest problem for water sources is phosphorus and usually none is recommended for a lawn.
It is recommended that you keep all fertilizers 20 ft. away for a water source. Also consider putting in a buffer zone of native plants that naturally grow on the water's edge. Then they can act as a filter for anything that makes it too close to the lake.