Soil textural formations typically encountered along irrigation canal banks comprise:
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Answer: C. Alkaline
Explanation
Soils along irrigation canal banks often accumulate salts due to continuous seepage and high evaporation. The capillary movement of water brings dissolved minerals to the surface, creating alkaline soil conditions. Alkaline soil chemistry is a common feature in arid canal-irrigated agricultural command areas. Seepage from unlined canals raises the local water table, accelerating upward moisture movement and salinization. High evaporation rates leave behind sodium and carbonate salts that elevate soil pH levels significantly. Alkaline soils typically exhibit high exchangeable sodium percentages that disrupt normal soil structure.
Drainage engineers install subsurface pipes near canals to lower water tables and prevent severe soil alkalinization. Farmers must apply chemical amendments like sulfur to reclaim alkaline canal bank soils for crop production. Lining irrigation canals with concrete helps reduce water seepage and minimizes adjacent soil degradation. Acidic soils develop in high-rainfall regions with leaching rather than in evaporating arid canal zones. Classifying soils as both acidic and alkaline is contradictory since pH is a singular logarithmic scale. Calcareous refers to calcium carbonate presence, but alkalinity specifically describes the high pH environment.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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