Battling deficiencies, expert help needed

Tassie grower

Tassie grower

Member
Have a few deficiencies going on atm 4 plants affected all in canna terra professional soil, temp humidity vdp all within range, not sure if it's calcium and or phosphorus or something else ph is always 6.2 runoff ph the same, maybe slightly overwatered, could use some expert opinions and diagnosis,
 

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Fallguy111

Fallguy111

Well-Known Member
If you’re overwatering it’s hard to tell because too much water causes many issues. If you’re top feeding dry amendments you have to be 2 weeks ahead of the game. Keeping a journal and running a cultivar multiple times will help you dial it in
 
HydoDan

HydoDan

Well-Known Member
Lou66 said:
Are you sure that site is any good? Besides the plethora of spelling errors it recommends epsom salt to treat calcium deficiency. Epsom salt contains no calcium.
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"What usually causes a calcium problem, is a lack of magnesium. Without magnesium, calcium can not be broken down properly by the plant, so though there might be plenty of calcium in the medium, it is not available to the plant."
 
Fallguy111

Fallguy111

Well-Known Member
I’m mostly a “bro scientist “ but I’ve never added calcium aside from pre amending lime/oyster shell but I do add a teaspoon of epsom to every other gallon of water. If I use ro I add every watering
 
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Lou66

Well-Known Member
HydoDan said:
"What usually causes a calcium problem, is a lack of magnesium. Without magnesium, calcium can not be broken down properly by the plant, so though there might be plenty of calcium in the medium, it is not available to the plant."
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Another reason to avoid the site. Calcium is passively taken up by the plant when transpiring. If there is excess magnesium in the root zone (as opposed to a balanced ratio) calcium uptake is even inhibited.
I do not understand how calcium can be "broken down". We are talking about dissolved ions. To break calcium ions into smaller bits you need a nuclear chemist wielding a particle accelerator.
 
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Lou66

Well-Known Member
Fallguy111 said:
I’m mostly a “bro scientist “ but I’ve never added calcium aside from pre amending lime/oyster shell but I do add a teaspoon of epsom to every other gallon of water. If I use ro I add every watering
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Then you have a soil rich in calcium or hard water. When you use coco (it acts as a sponge for calcium) and/or low transpiration (common under LEDs) calcium deficiency is rather common.
 
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Roguedawg

Well-Known Member
they look overwatered to me. All the cations compete with each other, some like K are easily and rapidly taken up all along the root, some are not like Ca. it is only taken up from the tip, but if you increase the amount in solution of one it will decrease the amount of another cation or all the other cations. The sum of cations taken up will always be almost the same, the amount of each in solution will effect how much of each cation is taken up.
 
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