Kentia palm dying

[Rp11]

My kentia palm is dying. 2 weeks earlier the pot fell. So I repotted and added some extra soil/ manure. Added some water the next week. This week the soil is still very moist. And the plant is yellow and brown.

[PalmatierMeg]

Does that white planter have drain holes? If so, how many and how big? If not, get the palm out of it ASAP. Most palms require coarse very well draining potting soil. They should never be left sitting in trays of water. I suspect you have overwatered that palm and it has root rot. Overwatering is common. People who don't know plants think water solves everything, but too much water is a major killer of palms. It may be too late to save your palm but if you want to try, toss the current soil and replace it with a coarse garden soil (preferably not Miracle Gro and no cheap black houseplant soil) mixed with pumice or perlite. Carefully rinse old soil off roots and inspect. White roots are healthy, dead/diseased roots are black/brown. Soak roots in hydrogen peroxide for 30 minutes or so to disinfect them. Disinfect or replace the pot. If you want to use the planter and it has no drain holes, drill 1" holes through the bottom. Water sparingly. Keep soil just moist, never soggy.

[oasis371]

Plant drowned. Pot looks too big and soil sounds like muck.

As was said above,  most (but not all) palms, need excellent drainage and want to dry some between waterings. Oxygen/aeration at the root level is really important.

I lost a a large Kentia a few years ago (since replaced by three Howea fosterianas and a H. belamoreana--I LOVE this genus!), thinking that I would "improve" the soil by introducing more organic matter.  Have since learned my lesson.  Especially in the cooler months, it's really important to not overwater these, and they can go into rapid decline. Sometimes, the best approach with palms is just to leave them be if they seem to be doing well.