A. single superphosphate
B. sulphate of ammonia
C. muriate of potash
D. NPK 15: 15: 15
Correct Answer: Option A
A. single superphosphate
A. single superphosphate
B. sulphate of ammonia
C. muriate of potash
D. NPK 15: 15: 15
Correct Answer: Option A
A. single superphosphate
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