It does make good sense on several levels.

If the wet soils are so wet as to support anaerobic microbes during that season, few nutrients will be released for use by plants. Nitrate will be reduced to nitrous oxides and N2, and escape the soil to the atmosphere.

Aerobic microbes are far more efficient decomposers, and nutrients tied up in organic matter will become available to plants.

If the soils don't go anaerobic, increases in temperature and light may have a lot more to do with it.

When fascism comes to America, it will be wrapped in the flag and carrying the cross."
--S. Lewis