If you took vitamins only and drink water, what would happen? You would die. Your body and the grass needs water to survive. Water is the most basic need other than oxygen, or carbon dioxide in the case of plants. The other problem is if you add fertilizer to a plant, it needs water to transfer it to its cells. Without this delivery device, the fertilizer is useless and can actually harm the plant instead of helping it.
The density of water increases as the salinity increases. The density of seawater (salinity greater than 24.7) increases as temperature decreases at all temperatures above the freezing point. The density of seawater is increased by increasing pressure.