In fertilizer labeling, what does the first number indicate?

In fertilizer labeling, what does the first number indicate?

• A. Total weight
• B. Nitrogen content
• C. Phosphorus
• D. Potassium

Answer: (B)

The first number on a fertilizer label shows the nitrogen content by weight. Nitrogen (N) is the nutrient that drives leafy growth and the green color of plants, so this number tells you how much nitrogen the product provides. In the common N-P-K notation, the first value is nitrogen, followed by phosphorus (as P2O5) and potassium (as K2O). For example, a label like 20-10-10 means 20% nitrogen, 10% phosphorus, and 10% potassium. This isn’t the bag’s total weight—the bag’s total weight is listed separately. Knowing the nitrogen level helps you choose a fertilizer that matches your crop’s needs: too much nitrogen can produce lush foliage with weak stems and delayed flowering, while too little can result in yellowing and slow growth.

The first number on a fertilizer label shows the nitrogen content by weight. Nitrogen (N) is the nutrient that drives leafy growth and the green color of plants, so this number tells you how much nitrogen the product provides. In the common N-P-K notation, the first value is nitrogen, followed by phosphorus (as P2O5) and potassium (as K2O). For example, a label like 20-10-10 means 20% nitrogen, 10% phosphorus, and 10% potassium. This isn’t the bag’s total weight—the bag’s total weight is listed separately. Knowing the nitrogen level helps you choose a fertilizer that matches your crop’s needs: too much nitrogen can produce lush foliage with weak stems and delayed flowering, while too little can result in yellowing and slow growth.