Which of the following is a macronutrient?

Step-by-step solution

Macronutrients (macro-elements or major-elements) are required by plants in larger amounts (generally present in the plant tissues in concentrations of 1 to 10mg/gram of dry matter). C arbon, hydrogen, nitrogen, oxygen, phosphorous, potassium, calcium, sulfur, and magnesium are the nine macroelements in plants.