The forgotten nutrient and the most important is water.
Calcium
carrots
Water probably
yes
Vitamin k
yes
The second most common metal in the human body is iron. Iron is an essential nutrient that is important for numerous physiological processes, including oxygen transport and energy production.
An important nutrient would be beta carotene, which the body uses to make Vitamin A.
Carbon, Nitrogen, Oxygen
which nutrient supplies the body with the most calories
Nitrogen is the most important Nutrient for turfgrass clorophyll production. Second to that is water (not a nutrient, but a vital part of the nutrient delivery system). Check with you local cooperative extension agency for Nitrogen recommendations in your area, then buy the highest quality, slow release fertilizer you can get and be prepared to water when necessary.