Is this some sorts of deficiency?

svalli · July 17, 2011

Most of new leaves on my Yellow Riesentraube have yellowing and dried areas beween veins. Lower and older leaved are fine. Could this be potassium or some other mineral deficiency? None of my other plants have similar symptoms. The affected plants are all in same SWC.
yellow riesentraube leaf symptoms.jpg

Sari

dice · July 20, 2011

Well, it could be potassium, magnesium, etc, but usually you compare
a picture and it seems to match half a dozen different mineral
deficiencies, so it is tough to say without more context than just
a picture of a leaf, unless it is really obviously one particular problem
(like iron or nitrogen).

You could test for potassium by giving them a feeding with tablespoon
per gallon molasses (if molasses is readily available there). It is mostly
sugars with about 5% potassium and some mineral trace elements. If
the yellowing leaves get much worse after that, it could be that
potassium levels are too high and are blocking magnesium uptake.

The yellowing reminds me of magnesium deficiency, but on my plants
the whole leaf gets yellow patches all over it without the necrosis, which
comes along weeks later. A tablespoon of epsom salt on top of the soil
and watered in with regular watering will treat magnesium deficiency.

July 17, 2011	#1
svalli Tomatovillian™ Join Date: Feb 2006 Location: Vaasa, Finland, latitude N 63° Posts: 838	Is this some sorts of deficiency? Most of new leaves on my Yellow Riesentraube have yellowing and dried areas beween veins. Lower and older leaved are fine. Could this be potassium or some other mineral deficiency? None of my other plants have similar symptoms. The affected plants are all in same SWC. yellow riesentraube leaf symptoms.jpg Sari __________________ "I only want to live in peace, plant potatoes and dream." - Moomin-troll by Tove Jansson

July 20, 2011	#2
dice Tomatovillian™ Join Date: Jan 2007 Location: PNW Posts: 4,743	Well, it could be potassium, magnesium, etc, but usually you compare a picture and it seems to match half a dozen different mineral deficiencies, so it is tough to say without more context than just a picture of a leaf, unless it is really obviously one particular problem (like iron or nitrogen). You could test for potassium by giving them a feeding with tablespoon per gallon molasses (if molasses is readily available there). It is mostly sugars with about 5% potassium and some mineral trace elements. If the yellowing leaves get much worse after that, it could be that potassium levels are too high and are blocking magnesium uptake. The yellowing reminds me of magnesium deficiency, but on my plants the whole leaf gets yellow patches all over it without the necrosis, which comes along weeks later. A tablespoon of epsom salt on top of the soil and watered in with regular watering will treat magnesium deficiency. __________________ -- alias