Question

explain the availability of nitrogen-containing compounds goes down in waterlogged soils

Answer 1

Answer:

Nitrogen gas from the air is converted to nitrate compounds by nitrogen-fixing bacteria in soil or root nodules. Lightning also converts nitrogen gas to nitrate compounds. ... In some conditions denitrifying bacteria in the soil break down nitrates and return nitrogen back to the air. This is usually in waterlogged soil.

Answer 2

In some conditions denitrifying bacteria in the soil break down nitrates and return nitrogen back to the air. This is usually in waterlogged soil. Improving drainage reduces this effect, making the soil more fertile by retaining more nitrates.