Topics:
Animal Nutrition, Animal Refresher
Nutrient Profile of DAP
Nitrogen and phosphorus content of DAP fertilizer:
- 18% & 46% respectively — Correct Answer
- 20% & 40% respectively
- 26% & 46% respectively
- None
Explanation:
Correct Answer: 18% N and 46% P respectively
DAP (Diammonium Phosphate) — (NH₄)₂HPO₄ contains approximately 18% nitrogen and 46% phosphorus (as P₂O₅). It is used as an NPN source in ruminant diets and as a fertilizer. In animal nutrition, DAP provides both NPN and a significant source of available phosphorus.
DAP vs Common NPN Sources
| Source | N% | P% | Use |
|---|---|---|---|
| Urea | 46.6% | 0% | Ruminant NPN |
| DAP | 18% | 46% (as P₂O₅) | NPN + P source in ruminants |
| Ammonium sulfate | 21% | 0% | NPN source |
Advantages of DAP in Ruminant Diets
- Simultaneously corrects NPN deficiency and phosphorus deficiency.
- Less rapidly degraded than urea → slightly reduced ammonia toxicity risk.
- Commonly used where both protein and phosphorus supplementation is needed.
Why Other Options Are Wrong
- 20% N and 40% P → neither figure is accurate for DAP.
- 26% N and 46% P → N% is too high (26% is close to ammonium nitrate).
- None → 18% N and 46% P is the standard textbook value for DAP.
📚 About this Topic — Animal Nutrition
This multiple choice question is from Animal Nutrition, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Nutrition to strengthen your preparation.
