Cal/Mag Problem? Help!

[OrgAeroMan]

These are two different strains in the same LP Aero tub that appear to have a Magnesium deficiency to me, does anyone have any insight? The first two are of the same plant, and seems to be taking the brunt of it, the second two are of the other plant and seem less affected. All of the new growth and brances are healthy and for the most part pretty vigorous. Only the fans are affected on the second plant and only the bottom most two fans on the first plant.I think I'm going to change out the res to see what happens. Any help would be greatly appreciated! Thank you!

 

[Herborizer]

I see PH issues and Too Much Light issues. Hard to really pinpoint until you give us all your details. Medium, nutes, water, etc.

 

[northstate]

Fill out the form and help will arrive pics are better than nothing though...NS
Ph fo sho and probable temp issue, Herborizer's correct.

 

[B. Friendly]

I see Calcium problems, not a Magnesium problem

check here next time a problem comes up https://www.icmag.com/ic/showthread.php?t=11688


Calcium (Ca) -Macro Nutrient and an Immobile element.

Calcium is another important element that helps the plants cell walls, cell division in making the plants stems, stalks, branches stronger, as well as contributing to root growth, mostly the newer root hairs, Calcium also helps enhancing the uptake of K in the the plants roots. Calcium moves really slow within the plant and tends to concentrate in roots and older growth.



When plants exhibit a Calcium deficiency the younger leaves are the first to show it as well as older leaves. The Leaf tips will die back, the tips may curl, and growth of the plant is stunted. The plant can show a weakness in the stems and branches, as well as a under developed root system that can lead to bacteria problems with roots dieing off. Having slow plant transpiration rates can aggravate the uptake of calcium. Make sure your soil isn’t very acidic, for calcium gets harder to be absorbed through acidic soils, Which leads to having a plant that is deficient in Calcium. The leaf tips, edges and new growth will or may turn a yellow/brown color that happen in spots and often surrounded by a sharp brown outlined edge and then the leaf tips die back. If too much calcium is given at an early stage of growth it can stunt the growth of your plants. Having to much of calcium will also flocculate when a concentrated form is combined with potassium. The parts affected by a calcium deficiency are the roots. Stem or petiole, young or old leaves.

Too much Calcium will lead to other micronutrient deficiencies. Calcium fixation is caused by many types of mediums such as: clay soils, unbuffered coco and humus. The lime tends to bond to these soils very easily. The stems of the plant will not be able to hold the plant up and will exhibit a white brown in between the veins of the leaves when having too much calcium. Also having to much potassium and or nitrogen will cause a calcium lockout.



Problems with Calcium being locked out by PH troubles

Very acidic soils with excessive potassium, dry and or wet soil. Lack of calcium in the soil may cause too acidic soil. This may cause to Mg or Iron deficiency or very slow stunted growth


Soil


Calcium gets locked out of soil growing at ph levels of 2.0- 6.4
Calcium is absorbed best in soil at a ph level of 6.5-9.1 (Wouldn’t recommend having a ph of over 7.0 in soil) anything out of the ranges listed will contribute to a
Calcium Deficiency.


Hydro and Soil less Mediums

Calcium gets locked out of Hydro and Soil less Mediums at ph levels of 2.0- 5.3
Calcium is absorbed best in Hydro and Soil less Mediums at ph levels of 5.4-5.8 (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Calcium Deficiency.




Solution to fixing a Calcium deficiency
To fix a calcium deficiency you can treat by foliar feeding with one teaspoon of dolomite lime or Garden lime per quart of water, Or Any Chemical/Organic nutrients that have Calcium in them will fix a Calcium deficiency. (Only mixing at ½ strength when using chemical nutrients or it will cause nutrient burn!)
Or you can take crushed up dolomite lime or garden lime in a gallon of water and water it in the soil. 1 to 2 teaspoons per gallon of water, which will be slow acting. Garden Gypsum, which is medium absorption. Limestone, which is medium absorption, Rock Phosphate and Animal wastes which are both medium/slow absorption. Note: Caution when using gypsum to an already acid soil (pH that is less than 5.5) can have a very bad effect on different types of plants by effecting the absorption of soil aluminum, which is poison to plant roots.


Now if you added to much chemical nutrients and or organics, (which is hard to burn your plants when using organics) you need to flush the soil with plain water. You need to use 2 times as much water as the size of the pot, for example: If you have a 5 gallon pot and need to flush it, you need to use 10 gallons of water to rinse out the soil good enough to get rid of excessive nutrients.

 

[OrgAeroMan]

The nutes are Advanced Nutrients' Grow A&B at 720ppm and a pH of 5-5.5. It's the LP Aero tub in the journals section. The temps are ~75 degrees and the light is 150w MH about 7-8 inches away, with a fan blowing on the hot spot. I think you might be onto something everyone with the pH as well as the calcium. I'm going to raise the pH to 5.8ish and see what I have to aid in the calcium. Thanks a bunch everyone, I'll post the results as they come.

 

[OrgAeroMan]

I have hydrated lime, is that cool? It should raise the pH as well as add Calcium. I'll just wait until someone hits me back, as I don't want it to go through the roof either. Thanks fellas/ladies.

 

[OrgAeroMan]

Anyone? Can I run the General Organics Cal Mag +? Will this get nasty?

 

[OrgAeroMan]

Problem solved.... Connnoisseur for flowering.

 

[touringfunkband]

Fill us in.. What did you do or change to fix the issues?

 

[OrgAeroMan]

I just started flowering, and changed the nutes from Sensi grow A&B to Connoisseur A&B with some Big Bud and Humic acid. The problem just went away. I guess it could have been any one of those things. I'm just happy it's over!