I have no idea what's creating this problem

[Django_TO]

Hi guys. So this issue only appeared on the girls i moved outside. So, they go out when's sunny/enough light and hot enough. At night and cloudy/rainy days they stay inside with plenty of natural light, in the same room as the tent.
The girls are 6 week old on early flowering. I'm respecting the VPD inside the room, (temps at 25-27 C, and RH around 60%). Outside maybe around 24-25 C. I'm using 11 liters pots with BioBizz light mix, tap water, rested at least 24h to avoid chlorine. AN Connoisseur bloom ph perfect a+b (1 ml/liter), Big Bud (1ml/liter) and untill now also B-52 (1 ml/liter). This is what the two girls outside have been getting. One of the girls is a RQS Easy Bud and one White Widow (both autos). You can checked them here: https://www.autoflower.org/ubs/blog/second-grow.141/details , the girls with the issue are Francelina and Broomhilda.
The issue, as you can see on the pics, are burned leaf tips. They appeared today i think, maybe yesterday. Now, this is what puzzles me: They haven't been fed enough nutes to show this issue (first thing i thought it was too much Nitrogen), and the girls inside, on the same feeding schedule, show no issues at all (the girls inside the tent). That makes me think the issue must be related to something that happened outside. Is wind or cold a possibility? I can´t figure it out. Anyway, today i only gave them ph corrected water (ghb ph down solution) and i think i'll keep giving them just that for a while. Does anyone have an opinion? Shoutout to @Builder0101 @420Forever @OttoCBD @Kyote @Mañ'O'Green @St. Tom @Waira.

Thanks.

 

[Proph]

No two plants from seed are the same, so comparing plants to each other can easily get the search for the problem off track. No two plants grow or feed the same. They each have different likes/dislikes.

You may have actually mentioned the problem (underfeeding).. But it could also be a ph or nutrient lock out. You will need to do a quick diagnostic of the ppms and ph. Check the ppms of your run off, as well as the ph of the root zone (with a soil ph meter, or test the run off as last resort). If the ph or ppms are high/out of range, then you can take steps to lower both. If the ppms are low and out of range, you may need to increase the feed on that one plant. But checking those two things will point you in the right direction!

 

[Mañ'O'Green]

When you say "Plenty of Light" indoors are you talking direct sun light? Plants moved from an indoor situation to an outdoor one need a "hardening off" period to acclamate them to the strength of the sun. Your plants are shuffling back and forth which can cause some stress and they may not be able to adjust. The other thing is the stagering number of Bio-Bizz grows showing up in here?

What may be happening is the plants going outdoors are transpiring at a much greater rate than the indoor plants. This greater respiration rate is carrying more nutrients into the plant and specifically calcium in your case. So what the correct amount is indoors is too much outdoors. Don't add any calcium for a week or so then go back at 50% of what you were doing.

 

[Kyote]

I moved my plants directly outdoors without hardening off. I do have them under a greenhouse tarp which lowers the lux from the sun to about the same as for flowering indoors. As Man' O' Green mentioned, they are pulling nutes hard from the roots being in direct sunlight. That's way more light than they were getting indoors. And moving them in and out all the time isn't too good on em either. Better to leave them outdoors in the wind and clouds and sun. If you can put them under cover outside when it rains, that would be good so you can control H2O and nutes.

Temperatures are what they are. 20 -23C is what I've had here too, with RH around 50%, and a maximum of 12 hours of direct sunlight, which are really nice conditions for growth.

I'm only going with 3g of Mega Crop (9-6-17), 1/5th a gram of Sweet Candy (0-17-28), and 1/5 a gram of Cal/Mag, and 1/5 gram of Bud Explosion (0-33-37) [er gallon of rain water during early flower. That is 60% of the recommended amount of MC, and 25% of the others. I've got a 4 foot tall Critical 2.0 in its 2nd week of bloom and is doing well at these amounts ( cross my fingers). I'm using 20 litre (5 gal) bags outdoors.

If I had that problem, I would just go with H2O for the next few days as they are probably needing 1 to 2 litres a day or so now, then go back to feeding at a lesser amount. I dunno, that's what I would do but it sure doesn't make it the proper path to walk. Or a good flush then lighten up on the nutes for a bit?? Or do the diagnostics as Proph suggested? Decisions decisions we all have to make and we learn from them. Another tool in the toolbox so to speak.

Have you asked them what they need you to do? Good luck and hope ur gurls get happy soon

.

 

[Django_TO]

No two plants from seed are the same, so comparing plants to each other can easily get the search for the problem off track. No two plants grow or feed the same. They each have different likes/dislikes.

You may have actually mentioned the problem (underfeeding).. But it could also be a ph or nutrient lock out. You will need to do a quick diagnostic of the ppms and ph. Check the ppms of your run off, as well as the ph of the root zone (with a soil ph meter, or test the run off as last resort). If the ph or ppms are high/out of range, then you can take steps to lower both. If the ppms are low and out of range, you may need to increase the feed on that one plant. But checking those two things will point you in the right direction!

Thanks. I still don´t have a ec/ppm meter. The PH on soil is quite stable. Around 6,3 near the bottom, around 6,6 nearer the top. Beside those issues they keep growing and seem happy, looking for light and growing pistils with a lot os thrics (so cool). I'm ordering a meter soon, let's see how i can handle this.

 

[Django_TO]

When you say "Plenty of Light" indoors are you talking direct sun light? Plants moved from an indoor situation to an outdoor one need a "hardening off" period to acclamate them to the strength of the sun. Your plants are shuffling back and forth which can cause some stress and they may not be able to adjust. The other thing is the stagering number of Bio-Bizz grows showing up in here?

What may be happening is the plants going outdoors are transpiring at a much greater rate than the indoor plants. This greater respiration rate is carrying more nutrients into the plant and specifically calcium in your case. So what the correct amount is indoors is too much outdoors. Don't add any calcium for a week or so then go back at 50% of what you were doing.

This makes a lot of sense. So i'm already giving those girls only ph correctd water, and i'll keep doing it for a bit. I also added more soil, filling empty spaces around the sides. starting tommorrow i'll start putting the girls outside gradually, increasing time each couple of days.
Thanks

 

[Django_TO]

I moved my plants directly outdoors without hardening off. I do have them under a greenhouse tarp which lowers the lux from the sun to about the same as for flowering indoors. As Man' O' Green mentioned, they are pulling nutes hard from the roots being in direct sunlight. That's way more light than they were getting indoors. And moving them in and out all the time isn't too good on em either. Better to leave them outdoors in the wind and clouds and sun. If you can put them under cover outside when it rains, that would be good so you can control H2O and nutes.

Temperatures are what they are. 20 -23C is what I've had here too, with RH around 50%, and a maximum of 12 hours of direct sunlight, which are really nice conditions for growth.

I'm only going with 3g of Mega Crop (9-6-17), 1/5th a gram of Sweet Candy (0-17-28), and 1/5 a gram of Cal/Mag, and 1/5 gram of Bud Explosion (0-33-37) [er gallon of rain water during early flower. That is 60% of the recommended amount of MC, and 25% of the others. I've got a 4 foot tall Critical 2.0 in its 2nd week of bloom and is doing well at these amounts ( cross my fingers). I'm using 20 litre (5 gal) bags outdoors.

If I had that problem, I would just go with H2O for the next few days as they are probably needing 1 to 2 litres a day or so now, then go back to feeding at a lesser amount. I dunno, that's what I would do but it sure doesn't make it the proper path to walk. Or a good flush then lighten up on the nutes for a bit?? Or do the diagnostics as Proph suggested? Decisions decisions we all have to make and we learn from them. Another tool in the toolbox so to speak.

Have you asked them what they need you to do? Good luck and hope ur gurls get happy soon

.

The thing is, it can get really windy around here. Even with 1,80 m walls around the terrace, it gets really strong. Kind of afraid of leaving them there when the wind is like that. But it will work out in the end. Keep on learning. Thanks.