Renaissance Man's Second Grow

[InTheShed]

They look great now so you obviously got back just in time. And nice work getting the plants up on blocks!


If your lights are generating any heat you you should have lights on from 8pm to 8am and off all day. Also, there's a bit of a claw at your leaf tips so you might want to consider cutting the nitrogen a bit.

 

[BakedARea]

Damn man! 106°! Ooof. I'd be so scared with those temps. Very little wiggle room. But when the vpd is holding, it helps calm the nerves. Here's what I got when I plugged those numbers in. Look right to your numbers? Do you measure your leaf temps too? I rarely measure mine but I find that it is consistently 3-4° difference.

Glad you were able to get back in time to give them a drench.

 

[Renaissance Man]

If your lights are generating any heat you you should have lights on from 8pm to 8am and off all day. Also, there's a bit of a claw at your leaf tips so you might want to consider cutting the nitrogen a bit.

Thanks ITS! I thought about changing my light schedule to something like that, but I'm not sure my tent is so good that I wouldn't get light leaks. That little fold on the inside of the zipper doesn't really help as I can see the light from the outside of the tent at night time. Not sure it would be enough light during the day to cause it to hermie, I just didn't want to risk it. So yeah, weighing my pros and cons, thought it might be best to keep them on during the day and I can at least watch the environment and adjust as needed, if needed.

Regarding the claw tips, I noticed that too. My organic fertilizer is supposed to last ~8 weeks. So I top-dressed the veg stage with 6-8-4 early on and then at flip, I top-dressed 2-8-8 for bloom. It seemed like it should be ok. The plant on the right shows the claw but the plant on the left does not... I have only fed water for the last 3 weeks except for the last feeding, I dropped a little bit of cal-mag and a tablespoon or so of molasses. Other than that, it will probably get just water from here on out..

I'm contemplating adding any of that Bloom Booster I have only because it is not organic and I really don't feel like flushing the plant at the end. We'll see if I change my mind in a few more weeks.

 

[Renaissance Man]

Damn man! 106°! Ooof. I'd be so scared with those temps. Very little wiggle room. But when the vpd is holding, it helps calm the nerves. Here's what I got when I plugged those numbers in. Look right to your numbers? Do you measure your leaf temps too? I rarely measure mine but I find that it is consistently 3-4° difference.

Glad you were able to get back in time to give them a drench.

Thanks Baked! Yes, that is the chart I use. There definitely is little wiggle room, but because I'm working about 10 feet away from the tent and monitor it almost hourly, I tend to make adjustments as best I can i.e. open the tent door slightly, adjust the inline fan to low, med, hi... etc. I haven't measured my leaf temps but imagine that you're probably right about the 3-4 degree difference.

This week is going to be tough as this is our outside temps

 

[EZCalyx]

Hey Renaissance Man,

I have a small suggestion for getting irrigation drainage out of your trays so it doesn't absorb back in. I had this same issue and worked around it by wedging something under one side of the drain tray so that most of the drainage flows to one side of the tray. I would then use a turkey baster to suck out the drainage and put it in a waste bucket to dump out side. This was surprisingly time consuming but worked. I eventually made a drain table that was slightly angled and I used roof rain gutters to channel the drainage into a bucket. This way I could irrigate and all the drainage would end up neatly in a drain bucket without a drop spilled.

 

[BakedARea]

This week is going to be tough as this is our outside temps

Ooof...yeah! Last year when outside got in the 90s, the inside of my tent was ready to melt! Haaa haaa. Just a couple days ago, barely jumped to 76° for us and my tent was 88°! I can't be near mine like you. So I'm at the mercy of my environment and equipment to try and keep it stable. When I'm home though and able to monitor the temps, I open up my door otlr viewing port for extra air too. Definitely helps like you mentioned.

 

[Renaissance Man]

Hey Renaissance Man,

I have a small suggestion for getting irrigation drainage out of your trays so it doesn't absorb back in. I had this same issue and worked around it by wedging something under one side of the drain tray so that most of the drainage flows to one side of the tray. I would then use a turkey baster to suck out the drainage and put it in a waste bucket to dump out side. This was surprisingly time consuming but worked. I eventually made a drain table that was slightly angled and I used roof rain gutters to channel the drainage into a bucket. This way I could irrigate and all the drainage would end up neatly in a drain bucket without a drop spilled.

Hey Calyx, thanks for the tips.. I thought about the turkey baster idea but it seemed to time consuming for me, especially because I'd have to go out and buy a turkeybaster.. Lol.. I actually raised up the pots now so they aren't sitting in the water, however, the water is still in the tray until ot evaporates which may create more humidity problems in fays to come. I may just go buy that wet/dry vac from Home depot.

 

[InTheShed]

I'd have to go out and buy a turkeybaster.

I may just go buy that wet/dry vac from Home depot.

I gotta say that if I owned neither of those two things, I'd get the bucket head before the turkey baster!

 

[Renaissance Man]

I gotta say that if I owned neither of those two things, I'd get the bucket head before the turkey baster!

you're right.. it's on my "bucket" list.. see what i did there?

 

[Renaissance Man]

Hey Gang,

So I think I'm having a nutrient issue. I last top-dressed my organic fertilizer of 2-8-8 about 4 weeks ago. The manufacturer said that it should last about 8 weeks but since it is organic, I won't get any nutrient burns. It looks like my leaves are starting to get lighter as if it was a nitrogen deficiency. However, not sure I should add N at this stage of flower (Day 27 of flower).

I am contemplating adding more 2-8-8 to see if that helps. I think it's the heat that seems to be stunting this grow. On my last grow, I seem to remember that the smell of terpenes began around this time, however, there are no signs of trichomes yet..

Here are my questions:

1. Should I add more 2-8-8?
2. Should I add Calmag?
3. Should I add both?
4. Should I add something else I don't have?
5. Should I add water only?

P.S. The lighting is hard to tell, but I think it's still noticeable.

 

[InTheShed]

Plants need nitrogen all the way through flower. Take a look at the tissue analysis below and you can see that they use almost as much in flower as they do in veg.

This is a pdf with plant analysis charts and graphs (with full detailed lab analysis) done on the macro and micronutrients found in three different strains of cannabis plant during veg and flower.

The varieties and analysis are from 2003, but I don't think we have modified the plant in the last 17 years to the extent that the nutrient results would vary that greatly today. Here are screenshots of the first three graphs:

Two out of three of them used more nitrogen in flower than in veg!

And I wouldn't give cal-mag unless you're seeing a deficiency in one of those two, or if that's your only source for nitrogen.

 

[Renaissance Man]

Plants need nitrogen all the way through flower. Take a look at the tissue analysis below and you can see that they use almost as much in flower as they do in veg.

This is a pdf with plant analysis charts and graphs (with full detailed lab analysis) done on the macro and micronutrients found in three different strains of cannabis plant during veg and flower.

The varieties and analysis are from 2003, but I don't think we have modified the plant in the last 17 years to the extent that the nutrient results would vary that greatly today. Here are screenshots of the first three graphs:

Two out of three of them used more nitrogen in flower than in veg!

And I wouldn't give cal-mag unless you're seeing a deficiency in one of those two, or if that's your only source for nitrogen.

Thanks @InTheShed! Well, I added some calmag too because it seems as though it is a magnesium deficiency. However, I think in my next water, I will top-dress some more of 2-8-8. This is my flower nutes. Today is day 29 of flower and I think they are stunted. In a couple of weeks, I will probably add my bloom booster.

I can't tell why this grow is so much more difficult than the last. It is either environment (summer vs. winter), nutrients (megacrop vs recipe420), or strain related?

 

[InTheShed]

Dunno but rather than adding more phosphorus or potassium, I'd be adding more nitrogen if you lowers are yellowing.

 

[Renaissance Man]

Dunno but rather than adding more phosphorus or potassium, I'd be adding more nitrogen if you lowers are yellowing.

ok, but its not necessarily lowers.. it seems to be new growth too

 

[InTheShed]

Yellow interveins would be magnesium deficiency which could start on the lower leaves as well because Mg is "somewhat mobile," so if only your tops are pale I'd try lowering the light intensity (or raise the actual fixture) and see if they green up.

 

[Renaissance Man]

Yellow interveins would be magnesium deficiency which could start on the lower leaves as well because Mg is "somewhat mobile," so if only your tops are pale I'd try lowering the light intensity (or raise the actual fixture) and see if they green up.

I'll raise the lights first, let's see if that does something.. Thanks ITS

 

[Renaissance Man]

So thanks to @InTheShed, I made some adjustments yesterday and it appears that I'm on the right track. It looks like leaves are starting to pray to the lights again.

The problem, like many others, is that I tried to many different solutions so I'm not sure what actually is working but here is what I did:

First of all, I have the P600 and P1000 on the ends at 100%. I lowered those to about 30%.
I raised the middle XS2000 up as well as the other two lights to about 16 inches above the canopy. It was previously at 12" above.

I also added CalMag of 1mL / Liter and pH'd my water to 6.5. I know, rule number one as make adjustments slow and watch for changes, but I panicked.

Lastly, I am still concerned that there is no trichome buildup yet. There is no scent at all.. and I mean nothing. I'm so disappointed in that. Really thinking at what I can do differently for my next grow.

 

[InTheShed]

First of all, I have the P600 and P1000 on the ends at 100%. I lowered those to about 30%.

I think dropping the intensite 70% is a bit extreme! I was thinking more like 20% as a test.

 

[Renaissance Man]

I think dropping the intensite 70% is a bit extreme! I was thinking more like 20% as a test.

copy that.. I just went to measure PPFD and according to my Photone app, at 100% I had readings of 910 on the left third, 1300 in the middle and 1040 on the right side. I dropped the left and the right to equal 800 PPFD which was about 50% reduction on the P600 and about 25% reduced light on the right side P1000..

 

[Renaissance Man]

I'm so disappointed in this grow. I am at day 36 of flower and no trichome production. I have been following the VPD chart as close as possible. I was defoliating like mad up until about week 2 or 3 of flower in order to get light and air through the canopy. It can't be the strains as one of them is a clone from my last grow that had excellent trichome production at this point. Maybe I locked out something? It seems that they are both deficient in Nitrogen. But the leaves turned down throws me off. And then of course, there's the heat.. Temps have gone up to 105F, but right now it's been holding steady at about 98F and humidity is 70-80%.

I'm so ready for the next grow.. forget this scrog method and I'm going to go back to my other nutes.. I don't know.. #frustrated