stehansen
ArboristSite Operative
Anyone know how to flush/buffer/treat this kind of salt damage?[/QUOTE]
Gypsum or any kind of sulphuric acid to lower the PH will help. If the PH is high the salt is not very mobil, if you lower the PH you will release the salt and can flush the area with fresh water to push the salt down past the root zone. Rather difficult with already waterlogged soil. I'm assuming that most of the trees in the flooded area of New Orleans will be dead by the time the water is pumped out. I used to farm next to the San Joaquin river and once in the 1980's it flooded and the water didn't receed until July and it killed about half of the Valley Oak trees there. As long as the trees were flooded in the winter time they could tolerate a long time under water, but when the water stayed until hot weather arrived, many trees were lost. That was flooded with fresh water, not near as bad as salty polluted water like they have in New Orleans.
Gypsum or any kind of sulphuric acid to lower the PH will help. If the PH is high the salt is not very mobil, if you lower the PH you will release the salt and can flush the area with fresh water to push the salt down past the root zone. Rather difficult with already waterlogged soil. I'm assuming that most of the trees in the flooded area of New Orleans will be dead by the time the water is pumped out. I used to farm next to the San Joaquin river and once in the 1980's it flooded and the water didn't receed until July and it killed about half of the Valley Oak trees there. As long as the trees were flooded in the winter time they could tolerate a long time under water, but when the water stayed until hot weather arrived, many trees were lost. That was flooded with fresh water, not near as bad as salty polluted water like they have in New Orleans.