Light stress or nutrient issue ?

[psixerpsx]

Hello so problems started when i transplanted them in durpeta universal substrate i had good results with it before added mykos and moved under stronger lights in flowering tent. Viparspectra p2000 on 75% 50cm and grow the jungle nemesis 200w older model without UV and dimmer so that is running 100% from 50cm.From transplant one week water only with rhizotonic which i found i use too much 4 ml every watering when it should be 2 and 2ml of terra aquatica fulvic and 0.8ml aminoxtrem bloom and cannazym . Once i added also shogun silicon on 75%dose.And leaves look like this i dont know if it is from light or nutrient related please help.also i did katana roots and calmag spray yesterday on recomended dosage as it have deficiency here and there but leaves did not change also problem is mostly on uppermost leaves not newest but like new which has already grown are affected most new growth look affected less

 

[Delps8]

It's not too much light, for two reasons - there are no symptoms of excess light and, at 50cm±, I'd guess that feeding your plants an acceptable amount of light.

Most light manufacturers have recommendations for hang height and dimmer settings for the various stages of growth. They're usually pretty good to follow.

 

[psixerpsx]

It's not too much light, for two reasons - there are no symptoms of excess light and, at 50cm±, I'd guess that feeding your plants an acceptable amount of light.

Most light manufacturers have recommendations for hang height and dimmer settings for the various stages of growth. They're usually pretty good to follow.

it is 45cm and 75% on that viparspectra and with photone app on my cheap motorola phone it states like 500-600 over canopies so it should be good... also chatgpt suggests it could be too much cytokinins and auxins from overuse of rhizotonic anybody have similiar experience with seaweed extracts ?

 

[Delps8]

it is 45cm and 75% on that viparspectra and with photone app on my cheap motorola phone it states like 500-600 over canopies so it should be good... also chatgpt suggests it could be too much cytokinins and auxins from overuse of rhizotonic anybody have similiar experience with seaweed extracts ?

600µmol is 300µmol+ from "too much light", based on the idea that the light saturation point for cannabis is 800-1000µmol. Increasing PPFD will increase your yield, if that interests you. Also, the PPFD recommendations on the growlightmeter.com website are the worst I've seen (been growing since 2017) so I you're best off disregarding them. If you don't want to increase your light levels to the light saturation point or thereabouts, I'd go with the recommendation on the Vipar site.

Which light do you have? I've got the XS 1500, the older model, and it's done well for me.

Re. nutrient issue-what's your temperature, RH, and wind speed?

 

[Wastei]

It's not too much light, for two reasons - there are no symptoms of excess light and, at 50cm±, I'd guess that feeding your plants an acceptable amount of light.

Most light manufacturers have recommendations for hang height and dimmer settings for the various stages of growth. They're usually pretty good to follow.

I'm on the other fence thinking it's better to follow the plants response to light and recommendations from actual real growers
experience?

You see light bleached plants and plants being fed excess light all over the forums blindly following manufacturers recommendations that's more targeted towards marketing? The numbers and recommendations are all over the place if you look at different manufacturer.

 

[russ0r]

Hello so problems started when i transplanted them in durpeta universal substrate i had good results with it before added mykos and moved under stronger lights in flowering tent. Viparspectra p2000 on 75% 50cm and grow the jungle nemesis 200w older model without UV and dimmer so that is running 100% from 50cm.From transplant one week water only with rhizotonic which i found i use too much 4 ml every watering when it should be 2 and 2ml of terra aquatica fulvic and 0.8ml aminoxtrem bloom and cannazym . Once i added also shogun silicon on 75%dose.And leaves look like this i dont know if it is from light or nutrient related please help.also i did katana roots and calmag spray yesterday on recomended dosage as it have deficiency here and there but leaves did not change also problem is mostly on uppermost leaves not newest but like new which has already grown are affected most new growth look affected less

Canopy temps?
Soil ph?
Yellowing can be nute deficiency or heat stress
Overfeeding is easy to do early on and the tips you show look like slight nute burn. If your using a good soil mix you don't need to feed for a month or two unless going straight to flower