Can you add a picture please, so we can see the text and graphs :)
The concept of limiting nutrients is essential to understand biological process.The nutrient in short supply relative to the others will be exhausted first and will thus limit cellular growth.
The usual way of determining which nutrient is limiting is to increase the concentration of one nutrient. If there is no effect some other nutrient is limiting.
The boiling point of tap water is 100 degrees C (not Farenheit).With a tablespoon of salt, it would be slightly warmer than that.
I hope I helped. God bless!