Question

Choose the complex fertilizer:

• A. Potassium sulphate
• B. Calcium ammonium nitrate
• C. Triple super phosphate
• D. Urea ammonium phosphate

Hint:

Single nutrient fertilizer → one primary nutrient (e.g., urea, superphosphate)
Mixed fertilizer → physical mixture of fertilizers
Complex fertilizer → chemically combined nutrients (e.g., NPK fertilizers) Always check whether nutrients are chemically combined.

Answer 1

The Correct Option is D

Step 1: Understand what a complex fertilizer is. A complex fertilizer is one that:
contains two or more primary plant nutrients (N, P, K),
provides these nutrients in chemical combination within a single compound.
Step 2: Analyse each option.
Potassium sulphate — supplies only potassium (K); single nutrient fertilizer.
Calcium ammonium nitrate — supplies mainly nitrogen; considered a mixed fertilizer, not complex.
Triple super phosphate — supplies phosphorus only; single nutrient fertilizer.
Urea ammonium phosphate — supplies both nitrogen (N) and phosphorus (P) in a single compound; hence a complex fertilizer.
Step 3: Select the correct option. Only urea ammonium phosphate fulfills the criteria of a complex fertilizer.
Hence, the correct answer is \[ \boxed{\text{Urea ammonium phosphate}} \]