Question
With reference to agricultural soils, consider the
following statements: 1. A high content of organic matter in soil drastically reduces its water holding capacity 2. Soil does not play any role in the sulphur cycle 3. Irrigation over a period of time can contribute to the salinization of some agricultural lands Which of the statements given above is/are correct?Solution
Statements 1 and 2 are incorrect : Organic matter increases the water holding capacity of the soil. Sulphur cycle has both terrestrial as well as gaseous parts, Sulphur being stored as sulfates in soil. Statements 3 is correct : Irrigation over a long period of time can lead to salinization because irrigated water contains dissolved salts which get left behind when water evaporates. Over time, concentrations of those salts can reach levels that make it more difficult for plants to take up water from the soil.
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