Growing in coco, have a manganese deficiency.

Hi folks.

Couple of days ago my girls were showing signs of cal / mag deficiency, as I am in a soft water area. I fed a little too much of the calmag to treat it and as a result have what looks like a moderately severe manganese deficiency. I hear that an overfert of magnesium can cause this.

I was planning to flush then refeed again in a day or two using much less of the cal mag, perhaps a 1/4 strength dose if that.

However, I have read that a foliar feed with a fert containing manganese can help treat the problem a little quicker.

I presume Canna A&B (which I am using for nutes) has manganese in it. Can it be used as a foliar spray? It doesn't say anything on the bottle about it. Has anyone got experience of this? Should I do it? What sort of dilution if so?

PS ph is fine at 6.0, and I am in veg

epsom salt can be foliar fed or just watered in

ohh wait a sec you said soft water ?
i just read a post about canna a & b are designed assuming you have atleast .250 ec water if not then they suggest running chelated iron
the def would show up as yellowing on the top of the plant ill just give you the link and you can read it for yourself
http://forum.grasscity.com/coco-coir/1129165-canna-coco-ab-calmag.html

Epsom salt is magnesium sulfate..... I have a manganese deficiency caused by too much magnesium!

tekdc911 said:

ohh wait a sec you said soft water ?
i just read a post about canna a & b are designed assuming you have atleast .250 ec water if not then they suggest running chelated iron
the def would show up as yellowing on the top of the plant ill just give you the link and you can read it for yourself
http://forum.grasscity.com/coco-coir/1129165-canna-coco-ab-calmag.html

Click to expand...

I already added a micronutrient called magne-cal, that seems to have caused the current problem.

Ok, so I flushed the plants with about 5 litres each, then refed with a mild nutrient solution (50% of my regular feed strength) with the magne cal at 1/5 strength and a little root tonic. I hope this was the right action to take, especially since my diagnosis ofc might not be 100% accurate.

WRT the hardness of my water, I have managed to find out that it has 15mg/l as calcium. I don't know how to convert that to EC, or if you even can. I do know this converts to 2.65 "Clarke degrees (English)" whatever that means and that mg/l=ppm if that helps!?