What is this nutrient problem?

[Madmunchies83]

Hey everyone,

I started noticing this on a few leaves on 2 of the plants a while back and now seeing it start on a third, please help, I have no idea what is causing this.

They are 5 weeks into flowering now, they were on 1200 ppm up to 4 weeks when I noticed it so I dropped it down to 1100 ppm to see how they do.

They are planted in 50% perlite, 40% coco and 10% compost under 2x 1000W LED lights.

Strain is a Blueberry cheesecake.

I've also noticed premature browning of the pistils on the plants, started about a week and a half ago. The only ventilation I had in the grow room was an open window with an oscillating fan blowing on them, at night the window was covered to block out any light.


Thanks all

 

[gr865]

Cal/mag

 

[Zincite]

Short and to the point.

 

[gr865]

Well I was in a hurry, should have told the ol boy that since he is using coco he needs the extra Calcium and Magnesium.
I use .75 ml of Cal/Magic and 1 gram of Epsom per gallon.

 

[ChronicCanuk]

I have read to stop using calmag after week5 flower is this correct or should you use it all the way through to flush time?

 

[dakotamoon]

I'm confused, (my natural state ) about Cal/Mag! I have followed Cultivator's instructions implicitly for ec/ppm! i.e. my feedings with first transplanted seedlings (after solo cup) .. My last feeding: (Our well water here is full of Cal/Mag but also contains a shitload of natural fluoride) so mixing RO (50ppm) with our well water - I came up with the recommended 175ppm, the feed with Dutch Nutrients Grow A +B - till the ppm registers approx700 ppm! (as per Cultivator's instructions)! Here is how my plants look: These 2 plants are on week 3 (from first seed popping), RH has been kept around 70%, and temps are a steady 77F. I'm mixing up some new nutes now, so should I add Epson salts, I've been told our well water is full of Cal, but have no way to measure that. I forgot to add that all feedings are as close to 5.8 PH as I can get.

 

[Madmunchies83]

Well I was in a hurry, should have told the ol boy that since he is using coco he needs the extra Calcium and Magnesium.
I use .75 ml of Cal/Magic and 1 gram of Epsom per gallon.

Thanks GR865!! Love this forum!

 

[Madmunchies83]

I'm confused, (my natural state ) about Cal/Mag! I have followed Cultivator's instructions implicitly for ec/ppm! i.e. my feedings with first transplanted seedlings (after solo cup) .. My last feeding: (Our well water here is full of Cal/Mag but also contains a shitload of natural fluoride) so mixing RO (50ppm) with our well water - I came up with the recommended 175ppm, the feed with Dutch Nutrients Grow A +B - till the ppm registers approx700 ppm! (as per Cultivator's instructions)! Here is how my plants look: These 2 plants are on week 3 (from first seed popping), RH has been kept around 70%, and temps are a steady 77F. I'm mixing up some new nutes now, so should I add Epson salts, I've been told our well water is full of Cal, but have no way to measure that. I forgot to add that all feedings are as close to 5.8 PH as I can get.

Isn't 700 ppm maybe a bit high for week 3 of growth from seedling? Personally if I grow from seed I'd only be on about 400 absolute max of 500 ppm at week 3. The instructions on the nutrients is a general recommendation, some strains just do better with a lower ppm.

 

[NOOOBIENOT]

Hello , 700 ppm is to high for them , 300 -350 ppm is plenty and always add in calmag for every watering , witch needs to be done every day at 5.8 ph , smaller amounts of nutes but give them every day, this is a form of hydro medium you are using and ditch the Epson salts ,2ml of A part and 2 ml of B part and 2 ml of calmag per gallon of R.O. water and feed 1 gallon of this every day .it will give you a good runoff you can't over water coco and perlite. be sure the ph is 5.8 and keep this going till last week before chop and then water only the last week of 5.8 ph , less is more with coco but feed it every day and a good runoff as this flushes out the last batch of nutes and adds the new nutes ,the plants will only take what they need and the rest is gonna build up in the pot hence the need for a good heavy run off ., 50 %Rh is a good number , and I hope those pots have plenty of holes in them as this allows air to get to the roots , hence cloth pots or airpots for coco mixes or the roots drown ,plastic pots are for soil not coco unless you drill a shit ton of holes in them .