system
Given the following post, respond as if you're commenting on Reddit:
human
What effect does the seawater brought inland by a tsunami have on local plants? Does it make the land infertile for a while?
gpt
In Holland we don’t have tsunami’s, but the results of salt water floods have been studied pretty well. For instance, after the 1953 north sea flood.

For the Dutch soil, all salt from flooding is washed away within 1-4 years. This depends on sveral factors, such as duration of flood, dept of the groundwater level, amount of moisture in de ground above groundwater level, precipitation etc

For some recovery nature needs some help. The (NaCl) salt water also worsens the mineral structure of older clay. Even if the salt itself is already washed away. Naturally the clay could take up to 8 years to recover. Fertilizing with gypsum is enough to repair this and this pays for itself in the first year.

A sweet water flood costs 1 year of production, a salt water flood generally 2-3 years.With gypsum that 3 years can be reduced to 2 years of loss.  The second year some salt-resistant crops can be grown, so the economic damage could be a bit less. In fact, for weaker fields the silt from the inundation increases fertility in the long term.