■ SALINE - ALKALINE SOIL.
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| what is saline soil |
◇ In Saline and Alkaline Soils, the topsoil is impregnated (soak or saturate with a substance) with saline and alkaline efflorescences (become covered with salt particles).
◇ Undecomposed rock fragments, on weathering, give rise to sodium, magnesium and calcium salts and sulphurous acid.
◇ Some of the salts are transported in solution by the rivers.
◇ In regions with the low water table, the salts percolate into subsoil and in regions with good drainage, the salts are wasted away by flowing water.
◇ But in places where the drainage system is poor, the water with high salt concentration becomes stagnant and deposits all the salts in the topsoil once the water evaporates.
◇ In regions with the high sub-soil water table, injurious salts are transferred from below by the capillary action as a result of evaporation in the dry season.
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