Nitrogen is.
Nitrogen.
The first element in the fourth period, which is used in making fertilizer, is potassium.
potassium
This chemical element is potassium (K).
Potassium is the element that used to be first to make fertilizer.
Nitrogen.
Nitrogen.
Phosphate fertilizer is a compound, not an element. The compound contains phosphorus.
nitrogen
gypsum
Sulfur
No, oxygen is not a group 15 element; it is a group 16 element. Oxygen is not used directly in fertilizer production but is involved in key processes such as nutrient uptake by plants during respiration and photosynthesis.