Which one is not a nitrogenous fertilizer?

Explanation

The correct answer is Triple phosphate. It is a phosphate fertilizer, primarily providing phosphorus rather than nitrogen. Ammonium nitrate, Urea, and Nitro phosphate all contain nitrogen, making them nitrogenous fertilizers. While Nitro phosphate is not primarily used as a fertilizer, it still contains nitrogen, which disqualifies it as the correct answer in this context.