Question:
Which one of the following is citrate and water-insoluble P containing fertilizer?
Which one of the following is citrate and water-insoluble P containing fertilizer?
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Rock phosphate is insoluble in water and neutral ammonium citrate, making it suitable mainly for reclamation of acidic soils.
Updated On: Sep 15, 2026
- DAP
- SSP
- Basic slag
- Rock phosphate
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Phosphatic fertilizers are categorized into water-soluble, citrate-soluble, and water/citrate-insoluble forms.
Step 2: Detailed Explanation:
1. Water-soluble P fertilizers: Single Super Phosphate (SSP), Triple Super Phosphate (TSP), Diammonium Phosphate (DAP).
2. Citrate-soluble P fertilizers: Dicalcium phosphate, Basic slag.
3. Water and Citrate-insoluble P fertilizers: Rock phosphate and Raw bone meal, which contain tricalcium phosphate $[\text{Ca}_3(\text{PO}_4)_2]$ soluble only in strong mineral acids.
Step 3: Final Answer:
Therefore, rock phosphate is the citrate and water-insoluble phosphatic fertilizer.
Phosphatic fertilizers are categorized into water-soluble, citrate-soluble, and water/citrate-insoluble forms.
Step 2: Detailed Explanation:
1. Water-soluble P fertilizers: Single Super Phosphate (SSP), Triple Super Phosphate (TSP), Diammonium Phosphate (DAP).
2. Citrate-soluble P fertilizers: Dicalcium phosphate, Basic slag.
3. Water and Citrate-insoluble P fertilizers: Rock phosphate and Raw bone meal, which contain tricalcium phosphate $[\text{Ca}_3(\text{PO}_4)_2]$ soluble only in strong mineral acids.
Step 3: Final Answer:
Therefore, rock phosphate is the citrate and water-insoluble phosphatic fertilizer.
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