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Sewage should be released in rivers only...

Sewage should be released in rivers only after oxidation by microbial techniques.

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i. Sewage is rich in organic matter.
ii. Releasing such sewage into natural water bodies like rivers would increase its organic content.
iii. The organic matter would get oxidized using the dissolved oxygen in water.
iv. This reduces the levels of dissolved oxygen and adversely affects the aquatic life in the water body.
Hence, in order to target only unwanted eeds and protect the crops from ill-effects of herbicides, herbicide tolerant crop plants are beneficial in agriculture.
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