Mag def? potassium def? sequestering agents?

[minds_I]

Hello all,

I seem to be getting this ailment from time to time and wanted your thoughts on it.




As you can see, the pic resembles both aspects of mag and K def. Possibly phosphorous.

Now, my city water is ground water softened with the use of sequestering agents to isolate calcium and magnesium ions using complex phosphates.

http://www.water-research.net/hardness.htm

edit: my water hardness is about 4-97 according to the chart. Realtively soft.


I wonder if I should get something like cal-mag??

Your ideas are appreciated.

minds_I

 

[Don Logan]

I used to get things like that. I use Cal-Mag now and everythings fine. You might want to try some - start it out at 1/4 strength and judge it's effects, then raise it slowly. Peace.

 

[sproutco]

Where on the plant did the leaf come from? Top, bottom, middle? Maybe you should give more details about your grow. How are the plants being grown? If soil what is in it? PH? Directions for testing are in my signature. What are the plants being fed? How much and how often?

This is not mag def so you can rule that out.

Those phosphate sequestering agents are not toxic to plants. Farmer use 10-34-0 at transplant with micros. This is a polyphosphate that aids micro nutrient absorbtion. What they will do is not only bond with cal and mag maybe but also with heavy metals like manganese or iron in your water or added in your ferts. This could allow the plant to absorb alot more than normal and possibly become toxic. More calcium and higher ph will alleviate heavy metal toxicity if this is happening.

If you depend solely on calcium and magnesium coming from dol. lime, this may run short especially after you have not transplanted in a while. You can boost levels periodically along with your regular ferts by using 1/4 teaspoon powdered gypsum and epsom salts per gallon of water. I like to do this every third or fourth fert with dol lime in the soil and everytime when not.

 

[ChaoticEntity]

calcium toxicity would be my opinion

 

[MynameStitch]

where on the plant did it come from?

Looks like either a very slow ntirogen issue or the start of potassium issues I think it may be nitrogen issues...... ntirogen can start from the leaf edges if its very slow, if it was calicum there would be spotting, calicum toxcicity has never been noticed in cannabis to my knowledge due to the fact that most nutrients do not carry heavy calicum levels because the nutrient can cause a huge imblance to other nutrients like magniseum and nitrogen phoshprus so companies use lower levels to help balance out things

What nutrients are you using, but also a note, if you say you are using softned water, there would be low levels of calicum and magniseum and replaced with sodium

have you tested the hardness of the water?

Sodium is horrible for plants and will cause big time nutrient imbalances, it breaks down the vascular tissue and slows flow of nutrients and water
sodium is absorbed before ANY nutrient which is why its bad

you need different water if your water is sofnted from water softners from your water company or home water

 

[minds_I]

Hello all,

Where on the plant-bottom- this is an older leaf. The disorder is slowly progressing up the plant effecing only older fan leaves.

The tip burn is present in all but hte top most leaves- this is what I gather as a slight fert burn (potent ewc/guano teas). The leaf edge discoloration seems to have appeared after the tip burn.

My water hardness ranges from 45-97. Relatively soft. It is however softened with a sequestering agent causing calcium and magnesium to bond and drop out of solution as I understand it. No salt is introduced.

I use ffof with 20% ewc and 30% perlite. I use ewc/guano/molasses/kelp teas.

The water report shows (and this was a few years ago) that the salt leaves are 49 mg/l. Iron ranges from "not detected" to 226 part per Billion (no iron??), Manganese from 46-92 PPB.

minds_I

 

[inflorescence]

It looks more like K deficency than Mg deficency to me because the margins are more effected than the interveinal space. Also, instead of the just yellow intervienal chlorosis with Mg, there is that marginal brown orange I'd except to see more with K.

I've seen potent guano burn in a similar fashion but I don't know if that was soley from the N in the quano or not.

I think the quano or something may be locking out your K or your simply using too potent a guano mixture.

 

[minds_I]

Hello all,

Well, the guanp is 3-10-1. I use liquid kelp with 4.5% K. In addition, I use dry molasses @ 2 heaping tbsn /gallon (3.5 liters actually). I dilute this depending on the plants looks and what I think the needs are. This can range from 1/4 strenght to full strenght.

I had fed the plant this leaf came from 5 days ago with above tea and 1/2 teaspoon of dissolved epsom salts in the gallon.

I will check again tonight but I think the progression has halted. She is 14 days into flower and either tonight or tomorrow night I will give full strenght tea with a dose of alaska fish shit for a N boost.

Anyway, my pH is always 7 as I use D.lime at 1 tbsn /gallon soil. Some others use 2 tbsn but FFOF has liming agents already in it. I do not recall excatly where I read it but FFOF is pHed to 6.3??? I do not understand why the need to nail the pH to 7 by overloading the D.lime.

Anyway, got about an hour before I can check them- maybe longer as I am sick today and feel like shit- if it was not for the desire for a bong hit I would nto even have gotten on tonight. cough, cough, sniffle.

Anyway, weather it be a K def or Mg, a folier spray with miracle grow (uck-but its quick and no clogging issues). But I am into flower now so I am not too keen on that. In addition, the kelp has Mg as well as K so if it is getting locked out in the soil, a folier feed would like be the way to go. And I have no issues with using the kelp

I will keep you informed- I will try and get some pics of the plant tonight.

It is a Golden Skush from seed that I acquired-thanks friend.

minds_I

 

[inflorescence]

Na and or Ca can cause a K lock. I wonder how much Na or Ca your guano or kelp has in it? Also, ammonium nitrogen can cause a K lock. Isn't guano high in ammonium nitrogen?

 

[Fatty Arbuckle]

does the boost of n 14 days into flower give you an extra leafy plant?

 

[minds_I]

Hello all,

The boost of N is to keep the plant from consuming itself too soon. The more green leaf- the more growth I presume.

I have read elsewhere of others needing to bump the N once or twice into flower-like at 2-3 weeks into12/12 and again at 5 weeks.

I think its a foxfarm product that slams them hard with like a 1/2 cup to a gallon just as you put them into flower.

I think the progression up the plant has stopped but tonight I did notice that she was asking for N anyway as the older leaves are starting to yellow in ernest.

I did not recall to bring the camera (arrrgg- I hate that too) but I promise tomorrow. I still feel kind of sick although being out with my girls did make me feel better- or was it the bong rip I took???

minds_I

Good night and good luck.