How much K2SO4 to add?
The older leaves of many of my faster growing plants look a brown with some
small holes. Reading here, this may be a sign of a K problem. So I found
got some K2SO4. I no longer have tables of Molar masses so how much of this
stuff do I have to add to raise the K level 1 ppm in 1000 liters of water?
The FAQ says I should aim for about 5ppm. It there a test kit for K? If so
who sells it? Is there any data on how fast this stuff is used?
Ed Tomlinson (tomlins at cam_org)
Home of pppdial: http://www.cam.org/~tomlins/pppdial.html