Can you plz help me diagnose this problem

Backwoodz

Backwoodz

Active Member
Hi guys and gals got some plants 3 weeks in veg but one of them are showing these rust spots,only on 3 leafs, it was a lower smaller leaf at first now it spread too 2 of the bigger leafs, im using nutes at 70% of my full dosage under a 400W MH. PH at 5.5 -5.8 water only when medium is dry which is about every 3-4 days, give thanks for any help/responses.
 

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morrisgreenberg

morrisgreenberg

Well-Known Member
if you ask most people on this forum, they will tell you 70% is too much nutes, what kind are yoiu using? i am still a novice, and aside from me coming here with issues, if it was my plant i would flush with regular PH'd water 3 times the pot size...for example 5 gallon pot needs 15 gallons water then feed 1/4 of the recomended dose
 
morrisgreenberg

morrisgreenberg

Well-Known Member
when did you start feeding? i am just about positive its nute burn, anyone i have spoken to about the nute issue never say go over 50%...take the advice i gave you up there, those burnt leaves wont recover but it wont spread, you should clean that up with a good flush my man and please, for my sake go easy with the nutes 1/4....we often make the mistake of trying to do too much to these plants and thats when we bump into issues
 
Backwoodz

Backwoodz

Active Member
Thanks bro,the thing that messed me up was 5 others with same feeding are growing good, this was the only one i got this type of problem with. I just watered them 2 days ago should i wait until the soil gets dry, or should i just go ahead and flush it?
 
brasmith

brasmith

Well-Known Member
Soil ph should sit at 7.0 so the plants can utilize available nutrients. WHen soil ph is lower than 6.5 some nutrients cease to be available for the plant to take in. Your plants are dealing with the beggining signs of ph spotting and nute deficiency.

Look at this ph chart and you'll see which nutes are available at what ph the soil is at.
 
brasmith

brasmith

Well-Known Member
Backwoodz said:
nute deficiency? I thought i was adding to much nutes..
Click to expand...
When your soil (must be at least 7.0) ph is at 5.8 then the plants cannot take in phospherous, calcium, and magnesium creating a deficiency in those nutrients. The margin of acceptance of nutes is delicate, so bring your ph up^^^^^.

Did you look at the chart i attached to my post?

That chart is priceless for figuring out available nutrients at certian ph.
 
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