Which of the following fertilizers is not useful for paddy rice ?
Correct answer: D. Ammonium nitrate
- A. urea
- B. DAP
- C. Ammonium sulphate
- D. Ammonium nitrate
Explanation
Urea, DAP and ammonium sulfate are commonly used nitrogen or nitrogen-phosphorus fertilizers in rice cultivation. Ammonium nitrate is generally not preferred for paddy rice because its nitrate nitrogen is more liable to leaching or loss under flooded conditions. Students may choose DAP because it is a compound fertilizer, but DAP is useful when phosphorus is also required.
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Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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