Advice please!

[avidgardener]

Hi there
I was wondering if anyone here could offer some advice to a frustrated grower...........
It's a soil grow in Bio Bizz All-Mix. I also use bio bizz grow and bloom. 1800 watts of HPS with loads of ventilation. Humidity around 50% and temps - 18-20c dark/22-25c lights on. Watered with 75% RO & 25% crappy tap, this comes out at around pH 6.3 give or take a point.
I have 20 clones of 3 different unknown strains at 21 days flowering. They were vegged for 20 days and did not need feeding during this time. they're in various sized pots - smallest in 15 litres largest is 30 litres. When I started flowering them I fed with 2ml/ltr grow and 2ml/ltr bloom and have carried on giving this at every watering which is every 4 or 5 days. They were also given Epsom salts at 2 weeks flowering - 1 heaped tablespoon in 10 litres of water.
Anyway - they have started to lose their fan leaves. All the symptoms are at the bottom and/or middle of the plants. All the plants are affected no matter what size pot. So what am I doing wrong?
Any help would be greatly appreciated
Avidgrower

 

[glock23]

When in doubt, I leach. I also like to use kelp to cover my trace element needs...do you have the Alg-A-Mic?

 

[avidgardener]

Hi
Thanks for the reply. I don't use the alg a mic. I tried it once and it gave me nothing but trouble.
Cheers

 

[Guest]

it looks like a phosphorus def. , but the picture looks just like a calcium def. Maybe 6.3 Ph may be alittle too acidic? when you add the nutes to it the Ph is going to drop even further , does the Biobizz allmix contain lime or oyster shell for Ph balance, did you add anything to your soil or is it just straight up?

 

[avidgardener]

All-mix is made in Holland especially for growing weed in. I add about 15% perlite to it.
Cheers
avidgardener

 

[Guest]

I think the addition of the epsom salts may be contributing to your problem , did the plants show they needed magnisium? I was told by a botany graduate once that Lime and epsome salt are very tricky substances to use , they are full of certain elements and lacking in others and they cause problems ,especially when you're using liquid ferts as well. I concur because like everybody else I've used these two substances on occasion and it always seems to cause more problems than it helped.
Truthfully, now I don't mess with the soil and my plants come out much better because of it. Plus your going all organic and Epsome Salts are just that...salt. I 'de flush the pots really well and see what happens. Good luck.

 

[avidgardener]

I just measured the runoff from a pot and it came out at 7.2. Could this be the problem?

 

[Dr Green]

http://greenmanspage.com/guides/plant_abuse.html

7.2ph in hydro is too high....

I would do a Flora Kleen, 1tsp to a gallon for one hour and then use nothing but water and see what 2 or 3 days brings...I also think nute lock...??

 

[sproutco]

I just measured the runoff from a pot and it came out at 7.2. Could this be the problem?

Nights are too cool. Try 68 f +(20c)

Pure sulfur can reduce your ph. .75 pounds per yard of soil. (27 cubic feet) 180 teaspoons in a pound. .75 x 180 = 135 teaspoons needed per yard. 1/27 x 135 tsp = 5 teaspoons per cubic foot of soil. .15 x 5 = 3/4 teaspoon per gallon pot. Sprinkle evenly on and water in.

You should use care not to use too much. Try 1/2 rate and see what ph you get after a week or so/several waterings. Then apply more as needed.

You can find sulfur at garden centers. Just call around.