Detailed Explanation:

Answer: Option 2 — 3 only

Among the three statements about agricultural soils, only statement 3 is correct. Statement 1 incorrectly claims that organic matter reduces water-holding capacity, when it actually increases it. Statement 2 incorrectly suggests soil plays no role in the sulphur cycle, when in fact soil is crucial for sulphur transformations and storage.

❌ Statement 1 – Incorrect: High organic matter content actually increases water-holding capacity of soil, not reduces it. Organic matter acts like a sponge, creating pore spaces that retain moisture effectively.

❌ Statement 2 – Incorrect: Soil plays a vital role in the sulphur cycle through microbial transformations (mineralization, immobilization) and storage of sulphur compounds like sulfates that are essential plant nutrients.

✅ Statement 3 – Correct: Prolonged irrigation, especially with poor drainage and high-salt water, causes accumulation of salts in the soil profile, leading to salinization that adversely affects crop productivity.

📝 Short Notes: Soil Properties and Agricultural Impacts

• Organic Matter Benefits: Increases water retention, improves soil structure, enhances nutrient availability, promotes microbial activity, and increases cation exchange capacity (CEC).
• Soil in Nutrient Cycles: Soil is integral to carbon, nitrogen, phosphorus, and sulphur cycles through microbial decomposition, mineralization, and nutrient transformation processes.
• Salinization Process: Occurs when irrigation water brings dissolved salts that accumulate in root zones due to evaporation and inadequate drainage, particularly in arid and semi-arid regions.
• Prevention of Salinization: Proper drainage systems, use of quality irrigation water, crop rotation with salt-tolerant species, and leaching of accumulated salts.
• Indicators of Salinization: White salt crusts on soil surface, reduced crop growth, increased soil pH, and presence of salt-tolerant weeds.