Soil growers!

One quick comment this is correct for hydro (example Grobo / coco )

But for soil ph range is 6 to 7

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I think to answer this correctly the question would be what kind of soil are you using (what is it made up of). Is there any time released nutes in it? Was the soils you purchased purpose to be used for Cannabis?

As for the plants looks like Cal/Mag or Nute lockout from Ph

In soil, manganese is best absorbed by the roots in the 6.0 – 7.0 pH range (some growers recommend keeping the pH slightly lower, from 6.0 – 6.5, if you suspect a manganese deficiency in particular)

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Yes soil was purposed for cannibas growing.


@Mpower11

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One thing with organic soil is most of the time growers don’t feed there seedlings any nutes because the soil is rich in nutes from the organic matter… They start to feed the plants nutes when they show signs of needing it.

I haven’t tried growing in organic soil before so I’m not sure if I’m the right person to offer a guide on this one… I just don’t want to steer you in the wrong direction… All my past soil grows have been in a peat moss mix

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Well I got my plants flushed out and boy was that a task. Ph 7.3 to start. End pH-6.2. Only easy part was pHing with that new soil pH pen as a side note I also tested leach water just to see if there was any differences between the two. They were both spot on. Hopefully I don’t have any more hiccups at least for a little while. Think I know how pH got so far off. I didn’t realize once u have nutrients in water and u pH before adding any boosters the pH solution should be diluted otherwise it causes a chemical reaction and pH swings. Saw it on a grow video channel and tested it out pretty weird to say at the least. Thanks guys for the advice once again saving my plants from imminent death. @Brotherbuddah @Mpower11 @buzzy6

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So the last few weeks have went by with any hiccups. Plants have been growing at a phenomenal rate. Soil pH is good at 6.4. I am feeding once a week with nutrients and supplementing cal/mag as well. A couple of days ago all plants looked fine and today some type of deficiency is showing. Cal/mag? In between nutrient dosing I am only providing ph’ed water. First pic is a few days ago and the bottom two are from this morning. Deficiency seems to be only showing on new growth! @buzzy6 @Mpower11 @Brotherbuddah @vegetato

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What exactly are you dosing, and what’s the temperature like in the tent?

My first guess would be that it’s just due to salt buildup - but since you just flushed it out recently maybe not.

It doesn’t look like cal or mag given it’s the new growth and not the oldest, more like manganese/zinc or something else.

Perhaps it’s just airflow or temperature-related?

Are you using distilled water in the humidifier as well?

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This page might help if you don’t already reference it, by the way: Nutrient Knowledge: Marijuana Plant Nutrient Deficiency & Excess Chart

Those charts can help to point out what it is, but be careful to take that info with care and not just start adding what it looks like it’s missing, as most times it’s probably another factor that’s causing it.

For example, it could be taking in too much of some other nutrient and just doesn’t have the appetite or energy/ability to locate and take in another. Maybe it’s just too warm, or needs just water and no nutes (maybe cal//mag) for a while, etc. Need more info as to what’s going in first.

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Vpd1.1 to 1.3. Temps with lights on consistent at 78-79 Fahrenheit.Lights off temps 71-73 Fahrenheit. I did add supplemental fan at plant level and medium speed early this week. Humidifier using filtered watered not distilled. Humidity holding at 60-65%

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Just re-read some of the prior replies here, if there’s nutrients in the soil you could just be overfeeding with additonal nutes.

If the humidifier’s been running there could be nutrients in that water it’s taking in (to consider when adding to soil) if it’s not distilled/low ppm.

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Crazy thing is it is only two out of the three and they are all recieving same nutrients and everything. I will try and give update later tonite after I get off work. @vegetato

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Do you always feed them in the same order? Reason I ask is depending on how well the solution is mixed the first or last one might be receiving more of something than another… that could be resolved by mixing it more thoroughly or adjusting which gets fed first to balance it out.

If this were mine, I’d just be cutting back on the nutes, down to bare minimum cal/mag and a very little bit of primary (npk) until the current issue is resolved.

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When feeding I do stir nutrients in between each plant to make sure they are evenly distributed. Will adjust feeding as suggested

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When is the last time you confirmed calibration on your pH metre? I only ask because it looks like Ph related to me

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@Fresh also how do the roots look? Are they white? If you don’t know the answer next time you have the pot dry I would lift the plant out of the pot to take a look

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I will check ph again tonite once I get home.

Look :eyes: like magnesium Deficiency but u can check for ur self an see what is closest plus u should know from what u been feeding it

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So I ph’ed them once again! All at 6.6. Pattern on deficiency or whatever is all the same on each plant. @Mpower11 @vegetato Any new suggestions?


The last pic is the start of whatever then it progresses to what the first pic looks like.

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I think @Mpower11 is right, your soil pH is probably the problem (a bit too high).

What are you feeding the plant along with the water, and what’s the pH of that solution when you add it?

It might help to get your solution down to pH 5.8 or so and feed with that until the soil is at a lower pH.

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Complete line of House and Garden nutrients designed for soil grows and transplanted into Foxfarm, happy frog soil about 2 weeks ago. @vegetato

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