Calcium Def

[Blackmelo]

heya shroom, looks like things are coming along great.

Sprout has been explaining things really well here, I just want to butt in on one little point.

Sprout, you said 1/4 teaspoon Epsom Salt per US gallon gives 30ppm of Magnesium.

that can't be right.

I feed 1 teaspoon per US gallon to get 30ppm.

Incidently shroom, I reckon your main problem is a magnesium deficiency...

 

[sproutco]

heya shroom, looks like things are coming along great.

Sprout has been explaining things really well here, I just want to butt in on one little point.

Sprout, you said 1/4 teaspoon Epsom Salt per US gallon gives 30ppm of Magnesium.

that can't be right.

I feed 1 teaspoon per US gallon to get 30ppm.

Incidently shroom, I reckon your main problem is a magnesium deficiency...

I found this about magnesium weights:
http://userwww.service.emory.edu/~jrevenn/Articles/dosing dry pmdd.html

Dry Dosing PMDD by Brian Revennaugh

Magnesium Sulphate (MgSO4): (1 teaspoon of MgSO4 weighs 5.4 grams or 5400 mg)
9.9% Mg 9.9% of 5400 mg MgSO4 = 535 mg Mg.
(535mg Mg/3030 mg desired Mg)x100=18% of the desired Mg or 0.88 ppm Mg
(Not enough, so the remaining Mg must be obtained by adding more teaspoons)
39.0% SO4 39.0% of 5400 mg MgSO4 = 2106 mg SO4.
51.1% H2O 51.1% of 5400 mg MgSO4 = 2759 mg H2O

1 teaspoon epsom in a gallon of water

5.4 grams in a teaspoon epsom divided by 3.8 liters = 1.42 grams in a liter

1.42 grams = 1420 milligrams

1420 x .099 to change the number to just magnesium = 140 mg magnesium in a liter

1000 mg in a liter = 1000 ppm

140 ppm magnesium in a teaspoon of epsom salts per gallon of water

His problem was not magnesium as he had 80 magnesium ppm. He had too little potassium and calcium. Mainly calcium shortage.

 

[ShroomDr]

Incidently shroom, I reckon your main problem is a magnesium deficiency...

But my last feeding regime (basicly when this started was

N 23
P 53
K 130
Mg 82
Ca 27.5 (not including my tap water Ca)
S 106
Fe 4

Thats really high for Mg compared to Ca and K

this girl is throwing me for a loop, but i think i got her feeding shedule pretty much down now.

Anybody think she will ever be beautiful again (other than the buds)?

5.5weeks deep with an 8-9 week strain

same pics from growlog

 

[guineapig]

I know you still love them, shroom......they just may recover.......

Incidentally, for a calcium deficiency there is a brand of bottled water called
"Sanfaustino" which i swear is a tonic for just these sorts of problems.........

-450 mg/l of natural calcium
-19.3 mg/l of magnesium

Bicarbonate (dissolved CO2) has been added which brings the pH down to the
wonderful number 5.9.......plants just love this stuff which is nicknamed "the calcium water"........

Even adding a little bit of this water to your regular water will make the plant perk up.

kind regards from a guineapig

 

[elftribe]

Well is it?
32 Days flowering (outta about 60 total days)






Growlog here, its a DWC
http://www.icmag.com/ic/showthread.php?t=34456
I don't see any insects, and there are none stuck to my yellow sticky traps. Someone else suggested Mg def, or insects, but i dont really see it.

What do you all think?

Finally, I found a pic that resembles my problem. White spots on the bud fan (large) leaves, some burned all the way through.

Same # of days into Flower. No bugs. Ph a little low for a few days (5.4, 5.5) . The problem is localized (couple of tops), not throughout. Also have some strapleaf in in newest growth (on all flowers). At first I suspected a hot spot from the lighting, which I did seem to have. Ec spiked for one night to 3.6 about a week ago. Holland Secret nutes (3 part), carbo blast, 2.5 ml cal mag/gal.

Did you figure this one out?

 

[SeaMaiden]

I'm horrible at mathematical calculations, I grow by feel. That plant is not suffering (at least not much) from a Ca deficiency. It *is* suffering from poor P uptake/utilization. If you think it's Ca, then a light foliar application of a Ca only product will tell you after a week or two, as it will stop progression of symptoms.

A couple of super handy charts for you. The flow chart is ugly, but useful. The pictographic chart leaves out completely Ca -/+ symptoms. I typically see Ca - present as necrosis of leaf margins and interveinal regions, rather regular pattern to it and the spots tend to be much larger than what you're depicting in your photos.

Plant's on the edge of N toxicity, too.

 

[ShroomDr]

WORST THREAD EVER!

First off, my problem was too high Mg, causing Ca lockout. If you look, you will see i am using more Sweet (and other supplements) than fertilizer. A total Newb mistake.

Secondly, half the responses in this thread are 'hidden'. The user Sproutco's posts are all gone, making the thread impossible to follow.

O how we learn in 5 years time.

Ive never in my life seen someone running an EC @ 3.6. Hell i keep mine < 2.2.

 

[Raglinroad]

Hey shroom. How weird that I hit on this thread b/c I am having lockout issues...and here you are posting 5 FREAKIN YEARS later....haha.

Anyhow, how did you fix your issue?

I had girls at 6.4 ph for days. Lower it to 5.8 and will see if they perk up...but the damaged leaves are not recovering. Oh, I am in week 3 of veg in DWC 900ppm botanicare pro grow/liquid karma.

 

[ShroomDr]

Anyhow, how did you fix your issue?

First, DROP ALL THE BULLSHIT. Forget using supplements until you have the fertilizer in line. Its hard to tell with one users responses hidden, but i was doing things backwards.

I was trying to arrive at a nutrient strength, rather than letting the plants tell me. Supplements, are just that, something that adds to something else (fertilizer).

FWIW I like Liquid Karma, but it is just as effective as a foilar (once every 2-3 weeks). Much cheaper on the wallet that way too.

I had girls at 6.4 ph for days. Lower it to 5.8 and will see if they perk up...but the damaged leaves are not recovering. Oh, I am in week 3 of veg in DWC 900ppm botanicare pro grow/liquid karma.

In DWC, the general consensus is 5.7-5.9pH, some let it float a little more. PPM is useless unless you list the your scale (so just post your EC). 'PPM Meters' do not measure parts per million.

Some strains are very light feeders, im sure 900ppm is probably somewhere between 1.3-1.8ec, if the plants are small, 1.8ec might be too high, and they are bushy and over 15" 1.3ec might be too light.

PPM SUCKS

 

[SeaMaiden]

Oh, jeez, I never even looked at the initial post dates. <facepalm>

 

[elftribe]

Thanks, sorry to bring up old memories. It does show us that it gets easier with practice.

The ec in my situation spiked because of transpiration and lack of attention. 2.0 to 2.6 is where I've been holding it for the most part.

I've had to go back and forth between RO and tap water and adding cal mag (2.5 ml/gal) to the tap has had me concerned. The carbo blast is also 1% mg and I'm still not totally convinced I need it in aero/ dead res.

thanks again