What's your late flower nutrient regimen?
- Thread starter Thread starter Tomatoesonly
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Nutty sKunK
Active member
Weed is an annual plant so it’s born to die. So I reduce N last couple weeks to produce a little fade. I’ve noticed less grassy smells as well come the drying period as well.
This zkittlez 8 weeks flower is ready for chop soon.
Ca++
Well-known member
The numbers are within reason, but it doesn't look like slow release? I think that's to top dress roses in the ground, during the season. Commercial growing involves soil testing and amendments before planting. This gets the ground right. We buy a bag of compost that's right, so at the point of planting, everything is correct. Both for us, and the commercial field growers. Then as the season progresses we need to fix what the plants have taken. Or react to their changing needs.
I would say buy decent multipurpose, and add ferts to the watering schedule. Nothing new about that. The numbers look fair, but I don't know the N source. I would guess it's the wrong one. Field dressing of ferts, isn't likely to be immediately available. Nor need it be food safe for ornamentals. Urea is likely.
I don't think it's worth trying, unless your seeds are worthless, the grow legal, and the outcome unimportant. Auto's are notoriously difficult. Wanting everything perfect, and offer no second chance. No time for a learning curve, and the product is meant to be worth more than a bottle of appropriate food. Which should really contain Calcium, if you are under good lights.
Ca++
Well-known member
I like that. Your buds never really suffered from N shortage, it was just the lower leaves doing there job. During the crop, using N from the leaves isn't as good as getting it from the feed. Here though, you just reduced the feed enough to see that some was coming from the leaves. Just some. As a sign the feed didn't contain excess.
Excess N at the end, can help the bacteria that leads to the straw smell. If you ever get that smell, speed drying to get below ~70% asap. IIRC it's an anaerobic bacteria, and a driving reason behind hanging our plants with good airflow.
A really well dialed in grow, might reduce the N without needing confirmation from the leaves. This is very debatable though. Commercial concerns such as feed costs and cleaning the media, may be better met by reducing the feed, even if it did lower yield a tiny bit. While in the home grow scene, false senescence is often a goal.
Something is wrong with this plant, it's rosetting. I think that straw smell might be seen in this grow, a bit too often. Or it may even be viral. It kinda looks like it was cold, but with a bit more to it. I suspect something is nipping away at it, cellularly.
Hiddenjems
Well-known member
If you let the plants finish it doesn’t matter what’s in your Rez. They stop uptake of nutes, and then water. Then they die.
That doeasn't happen at the time of our normal harvest window.
If 70 days is the normal harvest time then the plant won't be dead after 15 weeks of 12/12. It will take several more weeks before it dies on you
At day 70 they still take stuff in but not as much as at their peak
dogzter
Drapetomaniac
Then the plants not done yet.
Can't reach its full potential unless it's healthy and fully developed is my thought and experience there.
Nutty sKunK
Active member
This plant? Never had a straw smell, always like lemon, grapefruit and white pepper.
Has been cold, 60ish night temps for a while. Just threw a few colours.
I ain’t looking for yields this run just quality over quantity
Hiddenjems
Well-known member
As with everything it’s cultivar dependent. I’ve grown plants that would be completely dead before 10 weeks.
I’ve grown some of the same cuts for a decade. I test them in about every way imaginable. One of the first things I look for is how long the plants live.
Ca++
Well-known member
If it's completely dead, you're doing it wrong.
Running a plant that long, won't stop feed being taken in. Until the plant has dried where it stands, it's still taking feed in. The need for feeding is reduced within the normal time window, but they will still take feed if it's given. Even when dead, they will take feed.
Running a plant that long, won't stop feed being taken in. Until the plant has dried where it stands, it's still taking feed in. The need for feeding is reduced within the normal time window, but they will still take feed if it's given. Even when dead, they will take feed.
PadawanWarrior
Well-known member
Plants can't really decide to stop uptaking nutrients. If there are nutrients in their water, they will be getting nutrients along with the water.
Hiddenjems
Well-known member
When they stop uptake Rez concentration increases as Rez level goes down.
I use drain to Rez flood tables. It’s really easy to see when they’re done.
Hiddenjems
Well-known member
When I have it dialed in Rez concentration stays the same as it goes down. If I’m not concentrated enough concentration goes down as the level drops.
PadawanWarrior
Well-known member
I agree with C++. If they're completely dead at 10 weeks you're doing something wrong. My guess is overfeeding based on what you've said.
Ca++
Well-known member
Through grow and stretch, while growth is strong, the balanced use of food and water is likely. Once into bloom, water use increases and food use drops. In toms the top-up solution averages 30%, but in canna it's not published. Nor is it a steady thing, week after week. It's not that different though. The only study I found with little gain, was dwc changed weekly, but they top-up with pure water mid week.
I offered the link, as it's a study regarding many NPK ratio's and the expected drift. It might help you pull out useful data. I know from the numbers, that my constant pH gain is due to my high K use. Which is actually a near pointless part of my feed.
Frontiers | Optimisation of Nitrogen, Phosphorus, and Potassium for Soilless Production of Cannabis sativa in the Flowering Stage Using Response Surface Analysis
Following legalisation, cannabis has quickly become an important horticultural crop in Canada and increasingly so in other parts of the world. However, due t...
www.frontiersin.org
Aristoned
Well-known member
The only time I’ve ever “flushed” is when I put too much nutrient mix into soil. Basically, I gave the Kush water until the nitrogen poisoning cleared, then I began flowering nutrients.
Reading the plant will tell you everything you need to know, I’ve also found that any nutrient mixture labeled for cannabis is usually over-priced junk.
Cheers!
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Hiddenjems
Well-known member
That strain is usually harvested at 7 weeks. It looks finished at 6.
Aristoned
Well-known member
This thread has me thinking I may need a boost for these current genetics, how much magnesium should we be looking for?
I have Cal/Mag from GH, my only concern is not having a calcium supplement and I’m thinking calcium carbonate will be too basic as an initial estimation.
I have Cal/Mag from GH, my only concern is not having a calcium supplement and I’m thinking calcium carbonate will be too basic as an initial estimation.
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