diagnosis needed

Hello there!!! I am back with another marijuana problem.. hehe! I am 4 weeks in flower + 3 days. The strain is http://www.bigbuddhaseeds.com/Big-Buddha-Seeds-Strain-Guides/Big-Buddha-s-Strain-Bio-s/silver-cheese.html


Symptoms: Top leaves are getting light green colour with Brown spots and curling (claw), these leaves are dying.. I saw it First on one leaf but now goes to others too.

Any thoughts?

My thoughts: A boron or calcium, or manganese deficiency, or maybe a ph issue?

I am not monitoring ph, i give tap water and using biobizz nutes. This strain must be nute sensitive cause during 7 weeks veg i gave her only 2 times veg nutes and i experienced nitrogen toxicity. So i am staying on the low side of nutrients. Last feed was 4 days ago 0,93 EC bloom food only.

My medium : 33% perlite, 33% peat based soil & 33% compost.

Any questions feel comfortable to ask..

im no plant docter, but id definitely do a ph runoff test, would b very beneficial. a high ph could be locking out nute uptake.
aquarium dropper ph testers work best. if ph is high flush her out with ph'd water, if/when 5.8-6.5 nute her with upto 1.5 ec + calmag
& what are your room temps and when did u last water before the pics? (looks either over watered or under)
moar info the better, hopefully a pro will help further, gl

Hey chronicbongs thnx for your reply! I have convinced my self after tons of reading that if you have a good medium should be enough for buffering the ph. I know that many will disagree with that but really its a soil grow, which is supposed to be easier than hydro. If i ever change to hydro then ph is really important. I also don't like the idea of using chemicals in my biogarden and last time i was correcting my ph with vinegar i ended killing my plants... Plant also is droopy cause it was just watered looks better right now. temps are 21-22c and rh 45%

no probs, I am also a soil grower and yup its much easier then dro, even simple bubble buckets are a pain in the arse I find...(constantly changing 5 gals of water/checking ec's&adjusting/rootrot prevention= no fun. pro's with it 100% dialed in would def disagree loll)

I would still strongly suggest a simple ph runoff test to ensure the plant can uptake nutrients. correct ph is just as important in soil as in hydro. -if the ph is off- using some ph up and down isnt exactly going to 'chemically' alter your medium . or you could flush with distilled water to get ph around 7..

your plant rly needs more nutrients, is biobizz a veg nute?..-just looked it up.., i'd be using the bio-bloom with 1.2-2 EC in this stage of flowering.
also as far as avioding 'chem' nutes, blackstrap molasses tea would b a good add at this stage also,
gl and happy growing

Hey. thnx man you have a point, i must have really overdone it with low nutes, i will wait for her to get a little dry and i will give her a proper drink. Also i have ph drops but i also have Read from good farmers that there is no point in measuring the ph run off. Well, i have checked it in all my plants and it is around 7 but i really don't know if i can come up to a conclusion with that. And i also agree with the mollases plan i will give that a try too. Thnx!

Raise the light.

Are you using any limestone in your medium? It looks like your medium lacks minerals. Sure, a good soil buffers pH, but a good soil also contains a high percentage of silt and clay, not just organic matter.

*BUDS said:

Raise the light.

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you should be listening to Budz.

when nutrients arent being delivered, through lockout or scarcity, the LOWER leaves show the first signs. if youre having these problems in the tops, its sunburn.

Dr Kynes said:

you should be listening to Budz.

when nutrients arent being delivered, through lockout or scarcity, the LOWER leaves show the first signs. if youre having these problems in the tops, its sunburn.

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I will do that too, thnx! It's not only on tops but in the midle as well.

I vote rootbound.

*BUDS said:

Raise the light.

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Agreed

also what are your temps lights and pot size

chronicbongs you cannot PH soil once in use and TBH soil dose not need you to ph it at all you need to look at ph in hydro not soil

by looking at ur pot size is that a 1gal? if it is u need to pot up

It's a 3 gal, temps 70 -72, RH 45%

Throwing my vote in with the others for light bleaching.

i would not worrie to much at the stage ya at,but bit advice for next time up ya pot size.
ya comeing up to week 5 so the plant will start to yellow

light bleaching huh? Well, i am using an sgs 160 that got a little close to this one, about 14 ".Its the First time i am using it but for sure i wasn't expecting to burn them..

lospsi said:

light bleaching huh? Well, i am using an sgs 160 that got a little close to this one, about 14 ".Its the First time i am using it but for sure i wasn't expecting to burn them..

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Well light bleaching isn't the same as burning/heat stress. With bleaching, the chlorophyll, which gives leaves their green coloration, basically just gets used up and the leaves closest to the lighting will instead take on a yellow'ish/pale tinge.

Upped the light and fed bloom food EC 1,53. Lets see what happens..

For the record the plant is recovering from P ambudance ang light stress.