Excess water and salts in the soil forming the crop root zone are injurious to plants. Crop yields may drastically reduce on poorly drained soils. Under prolonged waterlogged conditions, the crops eventually die owing to lack of oxygen in the root zone. The main purpose of drainage is to provide a favourable root environment, which is conducive to the proper growth of plants. Artificial drainage is essential on poorly drained agricultural fields to ensure an optimum air-water-salt regime in the crop root zone.
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