Differentiate between inorganic and organic fertilizers, and describe the advantage of a slow-release nitrogen source.

Differentiate between inorganic and organic fertilizers, and describe the advantage of a slow-release nitrogen source.

• A. Inorganic fertilizers are derived from natural materials; slow-release nitrogen increases leaching.
• B. Inorganic fertilizers are produced by composting; slow-release nitrogen reduces efficiency.
• C. Inorganic fertilizers are chemical salts; slow-release nitrogen is not useful.
• D. Inorganic fertilizers are mineral salts; organic fertilizers come from natural materials; slow-release nitrogen reduces leaching and provides longer-lasting nutrition.

Answer: (D)

Understanding how fertilizers are categorized and how nitrogen is made available helps explain the difference. Inorganic fertilizers are mineral salts that dissolve quickly to supply nitrogen in readily usable forms. Organic fertilizers, by contrast, come from natural materials like compost, manure, or plant residues and release nutrients as they break down. The advantage of a slow-release nitrogen source is that it delivers nitrogen gradually over time, aligning with plant uptake, reducing losses from leaching beyond the root zone, and providing nutrition over a longer period. This combination—inorganic as mineral salts, organic from natural materials, and slow-release N that minimizes leaching while offering extended nutrition—best reflects how these concepts fit together.

Understanding how fertilizers are categorized and how nitrogen is made available helps explain the difference. Inorganic fertilizers are mineral salts that dissolve quickly to supply nitrogen in readily usable forms. Organic fertilizers, by contrast, come from natural materials like compost, manure, or plant residues and release nutrients as they break down. The advantage of a slow-release nitrogen source is that it delivers nitrogen gradually over time, aligning with plant uptake, reducing losses from leaching beyond the root zone, and providing nutrition over a longer period. This combination—inorganic as mineral salts, organic from natural materials, and slow-release N that minimizes leaching while offering extended nutrition—best reflects how these concepts fit together.