Recurring issues around week 5.

[Benjidubwise]

Greetings all
I've been growing for about 2.5 years now. I'm generally happy with the yield & quality but every run I hit a similar issue that starts around week 5 & progressively gets worse to varying degrees, depending on strain.

I know this is effecting the overall finished product but it's also just really annoying that I haven't managed to figure it out yet.

I'm running the full line of biobizz nutes minus the ridiculously priced 'Heaven'.

Everything else goes as follows:
Biobizz lightmix soil mixed with around 30% Cana Coco.
microbes from RealGrowers Recharge

Seeds from fastbuds/mephisto/greenhouse/royal queen.

Temps wander (depending on time of year) between 24&29 degrees C with the lights on & 18-24 with the lights off.
Humidity sits around 60% once out of seedling stage. I can't do much to reduce humidity, only raise it.
pH is 6.1 - 6.8 but usually at the lower end of that.
300 watt of LED light from Invisible sun UK
100cm x 100cm x 200cm tent.

I feed with every water & add microbes weekly.

The rust spots make me think it's a cal/mag issue but increasing the dosage of cal/mag doesn't useulaly have any benefit. So I'm guessing there's a lock out somewhere?

Does the nute schedule I'm on look reasonable?

Is it potentially something to do with my watering/feeding practice?

 

[blue]

Greetings all
I've been growing for about 2.5 years now. I'm generally happy with the yield & quality but every run I hit a similar issue that starts around week 5 & progressively gets worse to varying degrees, depending on strain.

I know this is effecting the overall finished product but it's also just really annoying that I haven't managed to figure it out yet.

I'm running the full line of biobizz nutes minus the ridiculously priced 'Heaven'.

Everything else goes as follows:
Biobizz lightmix soil mixed with around 30% Cana Coco.
microbes from RealGrowers Recharge

Seeds from fastbuds/mephisto/greenhouse/royal queen.

Temps wander (depending on time of year) between 24&29 degrees C with the lights on & 18-24 with the lights off.
Humidity sits around 60% once out of seedling stage. I can't do much to reduce humidity, only raise it.
pH is 6.1 - 6.8 but usually at the lower end of that.
300 watt of LED light from Invisible sun UK
100cm x 100cm x 200cm tent.

I feed with every water & add microbes weekly.

The rust spots make me think it's a cal/mag issue but increasing the dosage of cal/mag doesn't useulaly have any benefit. So I'm guessing there's a lock out somewhere?

Does the nute schedule I'm on look reasonable?

Is it potentially something to do with my watering/feeding practice?

All sounds reasonable - Here's a grow guide for Biobizz with lightmix that been used for years.
Give it a compare and see how it goes.

(I swapped from biobizz nutes to canna nutes and have had better results and feel more in control) (just leave the heaven out - i've done grows with just grow and bloom and some pk thats truned out fine .. some people only use bloom the whole way through for an auto)

My Bio Bizz LightMix Feeding Schedule

Week1 day 4
Bio Bizz Grow 0.5ml,Bio Bizz Heaven 0.5ml Per L

Week2
Grow 1ml,Heaven 1ml, Alg A Mic 1ml per L,

Week 3-5
Grow 2ml,Heaven 2ml, Alg A Mic 2ml per L CalMag 1 feed per week 3ml per 5L

Week 5
Grow 3ml,Heaven 3ml, Alg A Mic 3ml, Bloom 2ml per L CalMag every other feed 3ml per 5L

Week 6
Grow 3ml,Heaven 3ml, Alg A Mic 3ml, Bloom 2ml,CalMag every feed 3ml per 5L

Week 7
Grow 3ml, Heaven 3ml, Alg A Mic 3ml,Bloom 3ml, CalMag every feed 3ml per 5L

Week 8-10 week Pre-Harvest
Grow 2ml, Heaven 4ml,Alg A Mic 3ml, Bloom 3ml, CalMag

Week 10
Heaven 4ml,Bloom 4ml, No CalMag

Week 11
Plain Water (I have done this with out plain water and extended Week 10's feed till harvest day doesnt affect taste or smoke)

 

[blue]

Biobizz lightmix soil mixed with around 30% Cana Coco.

Oh .. I'd drop the coco. Just use the light mix, There's no point to it other than messing with your grow, both have different requirements.

This could be your issue.

 

[Benjidubwise]

Thanks @blue
I've got 3 seedling just risen this past week so I'll try your schedule out! Obviously the soil is already mixed but if I run into similar issues, I'll cut the coco for the next round.
Thanks again

 

[bad dragon bzzz]

It looks hungry, overall greenyness is a smidge too pale. 2nd the mixing of mediums, do soil or do coco.
I'm not a fan of root juice or heaven. Given that Biobizz say only week 1,2 for root juice save yourself some money. Been meaning to try activera, come in a squirty botle foliar feeding style?
First part of the schedule looks good, but the base nutes grow/fish,bloom needs bringing forward 2 weeks or so.
My first feeding of nutes is day 10 either 0.5ml or 1ml depending how the plant is looking, increasing by 1ml every 7 days.
Biobizz is considered a weak/light nute line, dont be scared of burning it after week 3 ish unless you go mental.

 

[Benjidubwise]

@manscaped thanks
I started to mix Coco in just to help with watering as the biobizz tends to go cement like on top when it drys out.
I'll definitely try without next run though

 

[bad dragon bzzz]

All soils will settle/compact and go a bit hard or crusty on top after x amount of waterings/feedings. I consider my medium very light and airy 4 parts biobizz lightmix 2 parts perlite 1 part vermiculite. Or after about week 5 a puddle forms on airpot, if ya try and water more it overspills or just sprurts out the holes. What can we do about that? Not much other than spread the watering out over 2 cups of tea, rather than 5mins and done like the first 3 weeks. Maybe 2 times over the last 4 weeks of a plants life i will take a dart (Jocky Wilson,Crafty Cockney,Phil the Power) type dart and stab the fuck out of the surface of the pot. Yes I could be harming a small percentage of very fine roots near the surface, but it splits my watering time in two, and im sure the bigger roots and the bottom of the pot are happier for it.

 

[myotis]

All sounds reasonable - Here's a grow guide for Biobizz with lightmix that been used for years.
Give it a compare and see how it goes.

(I swapped from biobizz nutes to canna nutes and have had better results and feel more in control) (just leave the heaven out - i've done grows with just grow and bloom and some pk thats truned out fine .. some people only use bloom the whole way through for an auto)

My Bio Bizz LightMix Feeding Schedule

Week1 day 4
Bio Bizz Grow 0.5ml,Bio Bizz Heaven 0.5ml Per L

Week2
Grow 1ml,Heaven 1ml, Alg A Mic 1ml per L,

Week 3-5
Grow 2ml,Heaven 2ml, Alg A Mic 2ml per L CalMag 1 feed per week 3ml per 5L

Week 5
Grow 3ml,Heaven 3ml, Alg A Mic 3ml, Bloom 2ml per L CalMag every other feed 3ml per 5L

Week 6
Grow 3ml,Heaven 3ml, Alg A Mic 3ml, Bloom 2ml,CalMag every feed 3ml per 5L

Week 7
Grow 3ml, Heaven 3ml, Alg A Mic 3ml,Bloom 3ml, CalMag every feed 3ml per 5L

Week 8-10 week Pre-Harvest
Grow 2ml, Heaven 4ml,Alg A Mic 3ml, Bloom 3ml, CalMag

Week 10
Heaven 4ml,Bloom 4ml, No CalMag

Week 11
Plain Water (I have done this with out plain water and extended Week 10's feed till harvest day doesnt affect taste or smoke)

I use light mix soil with biobizz Bloom Only & alg a mic supplement.
Water first 20 / 25 days
Feed / Feed / water cycle then.
Always have 10 - 20 % runoff
Week 3 / 4
1ml per litre of Bloom & Alg a Mic.
WK 4/5
2ml per litre of Bloom ,& Alg a Mic.

Week 6
Maybe flush, depending on the plants look.
After flush if needed I give 3ml of each.
Week 6 / 7
3 ml of each

After 6/7 weeks
I up it to 4ml of each if I'm feeling like they can take it.
If not then it remains 3 ml of each.

I don't do a final flush.

I Ike the results I get but could definitely improve in bud bulkyness. Lol
Hope this helps,
I've settled on this schedule now

 

[MIAutomatic]

I think you are running into toxicity issues, that looks more like light nutrient burn than under feeding to my eyes.

At a glance the amounts you are feeding don’t seem unreasonable, but if you are feeding with every watering and not watering to runoff at least occasionally even light feeding every watering could be causing too much nutrient salts to build up in the root zone. The fact that it starts around week 5 could be an indication of this.

It is also possible the coco is robbing the calmag the plants need, but if you have added additional calmag and that didn’t fix the problem, then I think you can rule that out. You probably don’t need to add the coco, but I don’t think it’s causing the problem.

I would stop feeding for a couple waterings and water till a little runoff each time and see if things get better. Contrary to what nutrient companies want us to believe marijuana is actually not a very heavy feeding plant. It has huge light requirements to get high yields, but doesn’t need correspondently high levels of nutrients.

good luck!