W6.Day.2(41)
The outside of the box temperature goes down so i turned on all of the lights
Temperature measurements indicate that there are hot zones from which the foliage should be removed. However, next to this hot zone, the temperature drops to an acceptable level.
W6.Day.3(42)
Nature takes its course - the central shoot bends the wooden sticks with its trunk and tries to grow taller than all the others. I can't allow it to do that.
I've partially isolated the hot zones, but this needs to be done within the foliage as well. I also need to figure out where the hot air should go. I should have opted for LED stripes without any heat generation. It's causing significant issues.
Some of a leaves burned of hot air. I'm working on solution.
W6.Day.5(44)
I've noticed signs that point to osmotic shock in my plants and have come to understand that water requirements for irrigation are highly dependent on ambient air temperature. The quantity of water suitable at 30 degrees Celsius is no longer applicable. Interestingly, this realization presents an opportunity for extreme cultivation at temperatures near the plant's tolerance threshold, as the plant would consume more water and thereby absorb more nutrients.
However, another possibility is that the issue is rooted in sodium toxicity rather than water imbalance. I've been using baking soda in recent days to adjust the soil's pH levels, which has led to leaf yellowing, a symptom of sodium's toxic effects on plants.
In conclusion, the minor sodium excess has acted antagonistically against essential nutrients like potassium, magnesium, and calcium, leading to their deficiency. This deficiency is particularly evident in the burning of leaf tips.
As a corrective measure, I've flushed the soil with 10 liters of spring water and plan to monitor both the incoming and outgoing pH and TDS levels during future watering sessions.
W6.Day.7(46)-1
Weekly Summary
This week, I made a serious mistake: I adjusted the pH with baking soda three times (from 0.25 to 0.35 grams per 1 liter). This led to an excess of sodium (and a deficit of antagonists like potassium and calcium) and alkalization of the soil.
Flushing with water did not fully resolve the issue, and I am preparing a more acidic solution to compensate for the elevated pH in the soil. I am still aiming to keep the pH of the drainage water around 6.5.
I also noticed that signs of improper nutrition can be observed not only through the yellowing of leaf tips but also through the condition of the foliage. Healthy foliage points upwards, while unhealthy foliage does not. This potentially opens up the opportunity for training a neural network that can diagnose the plant's condition from photos. Growdiaries, I want to join your team!
I like the craftiness ๐! I have made good experiences with Scr.o.G ing and lights under the canopy. Would only add them in flower though, I had added somewhere around 90w at 30 cm distance on a lollipopped plant. No fluff or popcorn buds anywhere to be found.
@MyDearDiary, always a pleasure, but again, itโs mostly about the individuals preferences. I just wanted to highlight to you that from my perspective there should be no issues to start carefully removing old leaves, without worrying that youโll stunt your plant. The more you grow the better youโll be able to read your plants. Seems like the curiosity is there already ;) any other questions, you can always DM me directly, if I can, Iโm always happy to help.
@Salokin, Thank you very much for this article
It seems that in a home setting, it's quite challenging to determine the photosynthetic activity of leaves and identify the moment it decreases. Making such decisions should be based on experience and the age of the plant and its individual leaves. I would be happy to conduct a series of studies.
Is there a university somewhere that studies marijuana growth? ๐
@MyDearDiary, hey growmie, I read this a while back, which was studied on sativa plants and their leaf photosynthesis rate with age
โ Compared with the maximum estimated y-intercept value, Amax and Rd decreased by 50% and 75% after approximately 9 and 28 days (Figure 1 and Figure 2). Similarly, Ls and ฯCO2 decreased by 50% and 75% after approximately 8 and 22 days. Although photosynthetic capacity declined steadily after leaf full expansion, we note that the compensatory metabolic activity of Rd decreased.โ
Full paper here https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7076434/
A wouldnโt deny that a mature leaf has a higher photosynthesis rate, however, as soon as maturity is reached the rate will go down, but also their metabolic consumption.
what is nice colour for your eyes, maybe far away from spectrum plant needs.
What ever cool leds you would use, they still heat up, that will play up with plant, because they touch each other.
output of such strip will make maybe brighter for your eye, but wont bring any countable result. through all strip its 10-15 W maybe, so what it brings ??? plus spectrum ;)))
i thought its one of photo contest attemps, but by your description - you are serious with it.
Hope it will work for you, but by pure math and facts - it should not.
All the Best !
@AsNoriu, The issue of temperature is not a concern for me, as I regularly use an infrared thermometer and make sure everything is within acceptable limits. Besides, the garland doesn't operate throughout the entire light day.
I treat this as a fun experiment.