Definition of macronutrientsCategorized 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:
Obtained from soil (or soil amendments/fertilizers)
* 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:
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