Following The Grow Boss tips on YouTube
"...yield is based on light, quality is based on growers talent"
"...number one problem is, too much light, too much water, too many nutrients"
Nutrients : (after having issues with nut burns, I decided to use Grow Boss's perfect ppm calculator)
Invasion T (Glomus intraradices BEG72 and TRICHODERMA atrovide MUCL45632) 1g / plant
Monster X mycorhizes (500 000 propaguls / Kg , made in vitro) 2g / 20cl then complete to make 1l
Humic Fulvic Booster (humic and fulvic acids) 1ml / 1l
Cannazym 2.5ml / 1lRhizoponics 0.4ml/1l
Canna Mono MgO 1ml/1l
Lights:
1 x Adjust-A-Wings Avenger 600w HPS SuperPlant Super Red 85000Lumens 2000K
Soil:Platinium Royal Mix premium quality
What is vapor pressure deficit?
Often, marijuana growers who have their plants in indoor grow tents or rooms with artificial lighting, take into account parameters such as temperature and relative humidity to maximize plants growth and bloom, thus obtaining abundant harvest with top quality flowers. As we will see later, these factors affect different processes of the plant, such as transpiration or nutrient uptake.
However, we usually forget about another important factor that is related to the aforementioned ones: vapor pressure deficit or VPD. Broadly speaking, VPD is the difference between the amount of water vapor that the atmosphere is able to retain (which depends on temperature) and the amount of water vapor contained in it (relative humidity). It is usually measured in kilopascals (kPa).
Providing our plants with a correct relationship between temperature and relative moisture will keep us on the right VPD parameters, increasing the plant’s activity and thus improving its growth and showing its full potential during the flowering phase. The ideal would be to adjust both parameters (temperature and humidity) to get the best possible VPD value, so that the development of plants will be amazing.In the chart above you can see the right temperature and moisture values to maximize the development of cannabis plants. The green zone shows you optimal values of VPD, in which it would be ideal to maintain the environment. The orange zone shows correct values, in which plants should not have problems to develop normally. However, red areas show values in which your plants will be very far from hit their full potential, since the relation between temperature and moisture is not optimal.
With relatively high values of VPD (between 5 and 12) plants tend to open their stomata and release a considerable amount of water vapor into the environment (increasing their transpiration). This increase in transpiration results in an increase in the plant’s photosynthetic activity, which will need more nutrients and will improve its overall growth, both during growth and bloom. The best range is between 7.5 and 10.5, which we have marked in green. However, we must be careful that VPD is not too high (dark red zone) since the plant would close its stomata to avoid releasing too much water vapor to the environment, which would result in fast dehydration due to excessive transpiration.
On the other hand, if VPD is too low (light red zone), the plant will also close its stomata for not releasing more water into the atmosphere, which in this case would be already saturated (it would have reached the maximum water retention capacity in a specific temperature). In this way, reducing transpiration will also reduce photosynthesis, which has a direct impact on the plant’s development and yield.
That way, VPD is essential when it comes to offer the best conditions for the development of plants, also to understand its water requirements according to the nutrients used and thus adjust them correctly to meet the grower’s expectations.
N/B: SAY NO TO DRUGS
-[Day 29]That plant doesn't like water 💦, I didn't give her any water at all since 13 days, and today after watering she is like Droopy except she isn't happy....
-[Day 35]Drooping at the end of the light cycle, can't photosynthesis during 18 hours, watering is good, not too much light , leaves temp 22.1C, purple stems, dark green Taco'd leaves ..... here we have proper Mg deficiency Doctor Watson , it's elementary !Added Canna Mono MgO 1ml/1l
-[Day 39]Finally Topped the plant
-[Day 45]That Spanish chica is soooooo capricious, she's telling me that she can't stand under the HPS and she didn't completely recover from Mag def , putting it back under the MH .....
-[Day 46]Back under the MH , she can't stand under too much light (HPS) ....
-[Day 47]Starting Operation "Walk with me or die"
-[Day 48]Water pH 6.5 (1l) , then water again (500 ml) pH 6.5 + Canna Mono MgO 1ml/1l , Total PPM : 504
-[Day 54]Water (1l in 5 gals pot) pH 6.5 + Rhizoponics 0.5ml/1l + Humic Fulvic 2ml/1l + Cannazym 2ml/1l Total PPM: 480
-[Day 57]Water pH 6.5 (1l in 5 gals pot)
-[Day 61]Water (2l) pH 6.5 + Rhizoponics 0.5ml/1l + Humic Fulvic 2ml/1l + Cannazym 2ml/1l + SensistarGrow 0.8 ml/1l Total PPM: 850
-[Day 65]Water pH 6.5
(Drain 520ppm)
-[Day 71]Water pH 6.5 + Humic Fulvic 2ml/1l + Cannazym 2ml/1l + SensistarGrow 1ml/1l + Diamond Sugar 2ml/1l Total PPM: 1000ppm
(Drain 900ppm)
I love your comprehensive notes along with your commentary on this diary. I have to say that I haven't seen anything remotely this detailed here. Kudos to you mate. Keep up all your hard work, I'll be watching :D
I have had great experience with medical seeds Mendocino purple kush! in fact I have a diary on here with some pics. Y greiga supposed to be killer! I'm looking forward to seeing how things go in this diary. happy growing bro!
@TheFairyBudMother,is a pain to grow this plant , she's droopy again after watering with bloom nootz .... she's is small compared to the others, but she's got the most nicest smell .
@JUNGLE_B4RNS,Curious to see how she turns out. I like a more indica leaning hybrid but I find these medical hybrids to be what I need and avoids me having to make unpredictable salads in my bowl to get the right feels.
@HOW_i_GROW,I'm not expecting a lot from this plant, she had some deficiency in Veg (Mag def). It's supposed to be 60% Sativa 40% Indica, but since I've trimmed here she's turning into 100% Sativa phenotype. She's making those thin leaves typical of Sativa's.
Very nice trellis work, Barnes. You're a craftsman and also a natural talent for the fishing net industry, I wouldn't doubt. ;-) On the other hand, your girls are coming along beautifully.
@CANNASIM, that plant wasn't able to photosynthetise during a full 18 hours cycle , she couldn't stand the same amount of light than the others , so she had run out of Mag very quickly, I had to give her Canna Mono MgO and needed to spray her with amino acids to force her DNA to reactivate all her life functions to be able to stand under the light .
@JUNGLE_B4RNS, 👏🏻👏🏻👏🏻 Nice to see the level of detail and effort/love you put! 👍🏻👊🏻, for sure the quality keeps up with that! what is Operation "Walk with me or die"?
I wish the grow didn’t pick on the only overwatering plant you have, you should send him a link of another grow. And I dont think he figured out the week 5 is actually 1 week of veg.
@Jocolope, he looks for failure and gives solution to avoid failures for the next time. He doesn’t really need to look on what’s going good or maybe just for saying it’s good .