Help me to identify problem in coco.

[maimunji]

Hi good people's. I grow in 4x4 600 w mh and my plants is in veg. I grow in coco hempy with perlite at the bottom rez. One of my plant have problem with yellow dying tips at the top. Environment is good 25 °C. and 70 Rh.
I use tap water at 150 ppm. 40 ppm of this is calcium and 10 magnesium. I feed with canna coco 5.8 ph. At 650 to 700 ppm total including tap water. I try different dosage of nutes but nothing helps. I try a&b at 2 ml/ltr. for week nothing change. I try flush with 1ml/ltr because run off ph is 5.4 now run off is 5.8 but problem hit hard after flush and tips at the top dying fast. Now I run 2.5 ml per litre and nothing change again yellow tips. Now I feed with 700 ppm and run off is 500 ppm.
I also try to add cal mag at recommended dosage from bottle 2ml/ltr. I try full dose cal mag half dose and now I run 1/4. Nothing change. Problem is from weeks plant grow well but put more and more yellow tips at the tops

 

[PerfectGrower]

If your tap water already has 40 ppm of calcium, adding a full strength cal-mag product is going to bring your level Calcium levels up higher than you want to be.


I'd back off and see how they respond. A single watering isn't going to give you all the answers. Stick to something, in this case lower your "cal-mag" product, and feed a couple times. Monitor results and let us know


Nutrient profiles need to be in balance. If you're going to "increase" you should do so with all of the products at the same rate. Don't just spike Ca-Mg. And whenever you do increase, do so gradually and monitor results.

 

[giroldo]

i would try increasing the base A and B slightly. I run about 10 Ml/gallon or about 3ml/L

 

[chronosync]

Is it possible too much Ca can make P unavailable? I had a problem with adding calmag for that very reason. My symptoms showed more of a burn on the leaves and starting from the center veins.

 

[maimunji]

I continued to run coco a&b at 2.5 ml per litre. Also run half dose cal mag extra. Plant grow like crazy and almous full half of my 4x4 but tips on new grow continue to yellow. Not huge damage like with flush with 1 ml per litre but yellow tips dont stop. I flush before 2 days with 750 ppm until run off is same because I feeded with 750 and run off is 500. I up feed yesterday at 820 ppm around 1.6 ec but today again yellow tips on tops and run off is 700 ppm. I also add small dose pk 13 14 to rez around 40 ppm to see if this will help if plant want to eat more pk.

 

[maimunji]

 

[maimunji]

Im almous sure its cal def I will up cal mag extra to full dose and will run for one week to see what will be different. Or will be better to stay at half dose and up a&b to 3 ml/ltr. I also will take clones from this plant and will run em again to see what actually she want.
I have same issues with one of my plants previous grow in peat most compost I really want to know what can cause this symptoms.
Ok i actually not sure its Ca def its look more like K- from what I read I see. Dont know I will surrender.

 

[chronosync]

?

 

[maimunji]

I mean I will surrender and I will let plant to grow with problem just don't know what is this.

 

[Scrappy-doo]

Looks like plain ol nute burn to me. And some calmag imbalances. I'd keep it simple and not add a bunch of other shit. Stick with the standard formula on the bottle just less of it. Doubt you need much calmag if you are using tap. 1/2 dose. Focus on the new growth prune away the damaged leaves and she will recover much faster.

That last pic looks nice.

 

[maimunji]

Thanks for help scrappy doo. There is no damaged leaves exept this 2 on top when I lower feeding. It is not nute burn problem start when plant is only 5 nodes and continues to today and plant have more than 30 tops. I have simular problem in peat most previous grow yellow tips at new grow and I feed only with tap water.

 

[chronosync]

Cut out the calmag.. It's not needed.. Your nutrients have enough when combined with stated 40ppm already in your water. What I think is happening is that too much calcium is inhibiting up take of other nutrients.

Keep feeding @ 1.2-1.4ec pH 5.8-6

 

[maimunji]

I will try Chrono but problem start before I buy and start adding cal mag. Its something different but I will try. Previous grow problem dissaper after I start to add cal mag at full dose maybe she is jush cal mag hog don't know.

 

[chronosync]

I see. Wish I could be more help. Good luck!

 

[Scrappy-doo]

Could just be a light feeder idunno but theres not many deficiencies that look like nute burn and thats what nute burn looks like. If it's not that then idunno. Good luck. If it's that finicky I prob wouod jus let it go.

 

[maimunji]

Burn tips stop when I hit with full dose cal mag at 300 ppm along with my tap with 150 ppm. This give me very high 450 ppm before I add basic nutes but can't do nothing half dose cal mag doesn't work. Im at 900 ppm now. What can I do? My only options is to cut basic nutes to accepting level at around 700 ppm for this stage of grow.
Any options? I don't want to run plant at this high ppm 900 ppm.

 

[maimunji]

Another options is to cut cal mag completely and start adding epsom but im sure problem will hit again. Its looks more like cal def instead of mag because plant dont show other sign only yellow tips at new growth. No purple petiodes, no curling, no dark green between veins like classic mag def.
Any help!?

 

[chronosync]

Why don't you try calmag @ 200ppm?
My tap water starts @ 325ppm. I'm not having any problems with anything source water related. Not that I know of. Can you get RO or rain water? Did anyone ask that yet?