Calicum problem?...Pics...

[Guest]

Hello everyone
First thanks for looking. This plant is causing me fits. Its the only one in my room giving me trouble. I thought it was a Calcium problem but not getting anywhere with Foiler spray of cal mag+. Problem is only on older leaves. Here is the info.

Thanks SunBursT
What STRAIN are you growing?...bagseed
What was the establishing technique? Seed
What is the age of your plants? Day 28 Veg
What PHASE are the plants in?....Veg
What Technique are you using? Bubbler
What substrate/medium are you using?, RockWool
What is the Nutrient temperature? 68Degrees
What Nutrient's are you using?15 mil PBP Grow /5milCal Mag+ per gallon in RO water
What is the TDS/EC/PPM you are using? PH Pen and TDS FROM Sunleaves
What is the pH of the "Tank"? 6.2
Are you sure your calibration is correct on your equiptment? Yes
When was your last watering? Top water 1 time a day utill roots are in water.
When was your last feeding change? (ie. grow-bloom-micro-additional) Went to higher Nutes 10 ML to 15 ML Problem was starting prior to change.
What size bulb are you using? 150 watt HPS
What is the distance to the canopy? 10in
What is your RH Factor? 35%
What is the canopy temperature? 78 degrees
What is the Day/Night Temp? (Include flucutaion range) 78deg/72 night
What is the current Air Flow? (cfm etc.) 120 cfm
Is the fan blowing directly at plants? Blowing up through canopy
Is your water HARD or SOFT? RO water with 5mil cal mag +
Has plant been recently pruned, cloned off of or pinched? Yes topped 10 days ago
Have any pest chemicals been used? If so, What and When? None
Are plant's infected with pest's NO

 

[MTF-Sandman]

What's the EC/PPM?
Does it rise or fall between topoffs?
How long since last res swap?

 

[Guest]

Thanks for looking
PPM is at 885 conversion is .7 and is staying about the same after each feeding. This res. got fresh nutes on Sunday so 4 days. Prior to that it was changed at 14 days and since then it was getting topped off.

Thanks Sun

 

[MTF-Sandman]

Is the damage spreading to newer growth? Looks like some kind of lockout, but if it's only on older leaves it would be one of the major nutes (N,P,K,Mag) that's being affected.

That PPM should be fine for plants that size...any chance the nutes are old or got hot?

 

[Brian1975]

6.2 is out of optimal range.
Here is an over-fertilized leaf-->

 

[Blackvelvet]

Too much cal mag +

Too much cal mag +

With 10 ml pbp grow and 5 ml cal mag plus per gallon of water, you will probably get potassium trouble. This may be what your seeing.

For plants starting out, 100 ppm nitrogen is good. To get this rate you would use 10.46 ml pbp grow and 2.26 ml cal mag plus per gal.

For increased growth with larger plants, 150 ppm nitrogen. To get this (actually its 143 n) you would use 15 ml pbp grow and 3.25 ml cal mag plus.

1 teaspoon = 5 ml; you don't have to be perfect just close

The above suggestions are based on having a 4:2:1 potassium to calcium to magnesium ratio. So if you got 100 ppm potassium, you would add 50 ppm calcium and 25 ppm magnesium. These 3 compete. Too much calcium could lead to a potassium or magnesium problem, etc... etc...

If you wanted 125 ppm n, sort of inbetween my 2 suggestions, keep the ratio of pbp grow and cal mag plus the same. 125/100 x 10.46 ml pbp grow and 125/100 x 2.26 ml cal mag plus per gallon.

Good luck growing!

 

[Brian1975]

Hello BV. So, are you saying that her dosage of calcium may be responsible for her potassium troubles?

 

[Blackvelvet]

Hello BV. So, are you saying that her dosage of calcium may be responsible for her potassium troubles?

There is a competition. With 10 ml pbp grow and 5 ml cal mag plus you get this:
k 94
ca 71
mg 30

You want k twice ca and k 4x mag. (This is a good starting point) Too much cal mag results in not enough k getting into the plant.

 

[Grat3fulh3ad]

Ca Mg and K do indeed interfere with each other's uptake...
While the 4:2:1 ratio is an arbitrary number someone picked out of a hat, and there is no perfect ratio, it is necessary to have more K available than Ca and more Ca than Mg... I run 120 : 97 : 64 K:Ca:Mg with absolutely no issues...

Much more likely, Using 6.2pH solution in rockwool is your problem... Back off on the cal-mag and lower your pH to the upper 5's...

 

[Guest]

Thanks for your replys.

Hey MTF yes it is spreading and I have been worried about the nutes altho none of my other plants are affected.

I will be cking my ppm of calmag + to see if it matches bottle I have seen a thread that questions it mix. Cked and 5ml per gal of RO is 420 ppm.

GH I will be bringing down the PH today To 5.8. And going with 2ml cal mag This should give me a PPM that matches what the bottle says 5ml will be.

BV thanks for your input.

Hey Brian thanks for the chart, Very nice

Thanks for replys

 

[Blackvelvet]

ppms of individual elements like 50 ppm calcium is not the same as what a ppm meter reads. They are different. So if you added 5 ml cal mag plus with 15 ppm mg, 25 ppm nitrogen, and 43 ppm calcium for a total of 15+25+43=83... A ppm meter would not be even close to this. Probably much more. It measures conductivity of salts which varies widely by what your using. Try the recipes I suggested.

 

[Grat3fulh3ad]

Just curious BV... you grow?

 

[Core]

i wonder myself.....Black Velvet do you grow?

and now you can't give me bad rep...L

 

[Guest]

After Looking at H3ads overall input to these forums... I think Im taking his advice LOLThanks again everyone.

 

[bartender187]

For plants starting out, 100 ppm nitrogen is good. To get this rate you would use 10.46 ml pbp grow and 2.26 ml cal mag plus per gal.

You make growing sound way too complicated.

Im with Head on this one, bring the PH down some and see how the plants react. Ive gone as low as 5.2, some strains just seem to dig the more acidic solutions.

 

[Blackvelvet]

You make growing sound way too complicated.

I spent 15 minutes doing all the math for you.

 

[Grat3fulh3ad]

math don't grow plants, sprout....

 

[Guest]

Thanks 187
BV thanks for doing the math, but Im interested in how it works in a grow room. I feel H3ad 187 etc have the experiance a noob like myself needs.
Like I said thanks for the input.

Here are her sisters (I hope)

Circle is around my #1 girl ( Confirmed)

 

[Blackmelo]

Hi sunburst, I have had a similar issue in hydro before and found out much later that it was most likely caused by me feeding too much nitrogen.
I'm not sure if that helps because it doesn't really seem like you are feeding too much nitrogen lol.

Anyway, like you I first thought it was a calcium deficiency and got some cal-mag. That just made the problem alot worse.
Finally I changed the reservoir, half strength nitrogen, problem sorted...

I seriously doubt that you are feeding too little calcium. Blackvelvet might have put you off with alot of decimal numbers that don't really mean too much, all you need to knkow is that 15 ml of grow and 5ml of cal-mag is going to give you too much calcium and magnesium and like with me is probably goingto make the problem worse. I would lay off the cal-mag comletely for a while. Then try and figure out why calcium is getting locked out.

ps: looking at your latest pic, it looks like your night time temps might be a bit low (this creates a slightly pale yellow crown). Keeping temps constant in hydro is a vital thing and can also affect nutrient uptakes.

 

[Guest]

ps: looking at your latest pic, it looks like your night time temps might be a bit low (this creates a slightly pale yellow crown). Keeping temps constant in hydro is a vital thing and can also affect nutrient uptakes.

Thanks I have a small room with a ac through the wall and im having a bit of trouble with temps. I am getting a 78day/64night reading at canopy and have been adjusting that to try to get the flux a bit closer . I also found today that my REZ was 60 degrees so I put my heater back in it to get back up to 70.