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Definition of macronutrients

Categorized under "General"

Definition as written by Greenwood:

An element - such as carbon, hydrogen, oxygen, or nitrogen - required in large proportion for the normal growth and development of a plant

Definition as written by Plant_Geek:

Mineral elements which are required by plants for growth and which individually make up to 0.5% to 3.0% of the dry weight of a plant. Macrocutrients include: carbon (C), hydrogen (H), oxygen (O), phosphorus (P), potassium (K), nitrogen (N), sulphur (S), calcium (Ca) and magnesium (Mg).

Definition as written by JaxFlaGardener:

Macronutrients are the first nine of the sixteen essential elements for plant growth:

Obtained from water:
Oxygen (O)
Hydrogen (H)
Carbon (C)

Obtained from soil (or soil amendments/fertilizers)
*Nitrogen (N)
*Phosphorus (P)
*Potassium (K)

**Calcium (Ca)
**Magnesium (Mg)
**Sulfur (S)

* N, P, and K (in this order) are the macronutrient essential elements listed as the three numbers on fertilizer labels and under the guaranteed analysis

** Ca, Mg, and S are considered "secondary" macronutrients by some sources

In addition to these macronutrients, the other essential elements for plant growth (known as micronutrients) are:
Iron (Fe)
Boron (B)
Manganese (Mn)
Molybdenum (Mb)
Chlorine (Cl)
Copper (Cu)
Zinc (Zn)

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