Tip Burn

[Trainer01]

 

 Hi,

  I'm seeing some major tip burn across the garden.  It starts in around week 2 of bloom.  Up until this point, everything looks fine.  As bloom progresses, the desiccation starts to move in around the leaf margin.  I have more pics, but the forums only allow a 500k upload and won't let me delete to resize.

 

Details:

Temps and humidy max at 83deg/60%.  

I'm growing in sunshine mix 4 soilless.  

Watering frequency ~3 throughout bloom

7 gal smartpots

airflow is good, but not TOO direct I wouldn't think

Using an RO filter

PH 6.0-6.2

water temp ~72 degrees F

600W at a good distance from the canopy (vented)

 

Here's my regimen:

 

week 1-2:

- 1/2 tsp of pro-tek

- 1/4 tsp of hummic acid

- 3/4 tsp of dynagrow Grow formula (7-9-5)

EC ~.8

 

week 3-8:

 

- 1/2 tsp of pro-tek 

- 1/4 tsp of hummic acid

- 1 tsp of General Hydro FloraNova Macro

- 1/2 tsp of General Hydro FloraNova Micro

EC~.6

 

week 9: water

Edited May 16, 2013 by Trainer01

[Celliach]

Too many nutrients.  I think you're overfeeding.

[+Malamute]

Looks like ph burn and imbalance causing nutrient lockouts and likely calcium deficiencies, magnesium deficiencies, Iron surpluses and several other issues.

[Trainer01]

I appreciate the feedback, but I have to disagree.  I've calibrated my PH meter and measured the runoff.  The runoff is at 6.1 when running straight 5.8 water.  EC runoff is .3.  I've listed my nutrients above.  There is no indication of toxicity.

 

[+Malamute]

That is too acidic for soilless grows.

 

 Since you are using smart pots, I assume that is what you are using?

 

And less nutrients needed likely.

 

You seem to be trying to run with hydro ph levels.

[Trainer01]

What would you recommend for soilless?  You are correct with the smartpots.

[Trainer01]

That is too acidic for soilless grows.

 

 Since you are using smart pots, I assume that is what you are using?

 

And less nutrients needed likely.

 

You seem to be trying to run with hydro ph levels.

 

Less than .6 EC?  Everyone I talk to says that I'm already incredibly low.

[subpar]

Yeah T, the feeds are too low going into heavy bloom. I'm basing that on ur ec listing of. 8/.6

 

What u see as tip burn is actually pretty serious K deficiency. Fringes raise, tip crisps up, moves to the edges, rust like spotting, eventually a soft undercurl with progressive necrosis . Darkish leaves with a bluish hue is the P kicking in too. Usually the calyx will fail to develop & swell and u might c the cola tips stall out with the pistils prematurely dying back. It revolves heavily around the K.

 

But that's just my take on it.

 

Personally feel u should be around 1-1.2 at veg/first week or two flwr, and u should be bumping 1.5+ wk 3-8, followed by ur 2wk just water flush. Never used dg so I can't speak from direct experience on that mix. A lot depends on temps/rh and plant preference.

 

Btw, peeps just see 'tip burn' and say overnuted ... Several reasons for it, and urs is a K Def.

Edited May 17, 2013 by subpar

[Dlo]

Something isnt right. If the - 1 tsp of General Hydro FloraNova Macro- is floranova bloom, it seems you would be close to . 6 ec. right there. If you started that at week 3, it may be built up in the soil. Double check the probe. JMIO