DR. VonDankenstine
Well-Known Member
Please post any questions or comments you may have about your grow and if I don't have the answer-I will point you in the right direction. I am here to share ideas and help anyone out that needs it.
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drifter1978
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hello doc could you please tell me what is going on with my passion # 1 plants please i think it is over watering but could also be nute burn thanks
check out my grow for pictures page 2 of thread
https://www.rollitup.org/grow-journals/122840-multi-strain-grow-journal.html
check out my grow for pictures page 2 of thread
https://www.rollitup.org/grow-journals/122840-multi-strain-grow-journal.html
AdReNaLiNeRuSh
Well-Known Member
Hey...
So, I started around 20 plants from seed. It's been almost 3 weeks now and I still haven't sexed them. I was thinking that instead of sexing them, then pushing them back into veg state, I would just let them go another week or so, then, by keeping a vigilant eye, start budding and weed out the males, leaving the rest. To me, this makes more sense and helps to avoid an unneeded, potentially stressful situation for them.
Does this sound like a good idea, or it is really a necessity to sex them early on then process?
-AR
So, I started around 20 plants from seed. It's been almost 3 weeks now and I still haven't sexed them. I was thinking that instead of sexing them, then pushing them back into veg state, I would just let them go another week or so, then, by keeping a vigilant eye, start budding and weed out the males, leaving the rest. To me, this makes more sense and helps to avoid an unneeded, potentially stressful situation for them.
Does this sound like a good idea, or it is really a necessity to sex them early on then process?
-AR
Picasso345
Well-Known Member
Ok Dr, I see this question a lot on RIU. A definitive answer would be nice:
The first and second set of real leaves turning yellow around three weeks into a soil grow. Lack of nutes?
The first and second set of real leaves turning yellow around three weeks into a soil grow. Lack of nutes?
DR. VonDankenstine
Well-Known Member
You can keep the fluorescent lights a inch or two above the plants as long as the flouros are not t5's(they can get warm and hurt the seedlings). I start my seedlings under fluorescents for the first two weeks with just plain water-at the end of the 2 weeks I move them under a 400HPS. Some growers start there seedlings right from day one with HPS/MH lighting but you need to have ample distance between the lighting and seedlings I would start at 2 1/2 to 3 feet above the canopy if you choose to use your MH from the start but the choice is yours.
DR. VonDankenstine
Well-Known Member
I went through your journal to try to get a picture of what is going on----I was only able the pull up the first set of pics of the passion #1--It is showing a deficiency not over-fert---I understand that you are using 100% coco-------why are you flushing all the time? Have you checked your runoff PH and ppm's.Where are they at from that Passion #1 plant?
DR. VonDankenstine
Well-Known Member
So your talking about putting them under 12/12 at week three to find the sex out?Hey...
So, I started around 20 plants from seed. It's been almost 3 weeks now and I still haven't sexed them. I was thinking that instead of sexing them, then pushing them back into veg state, I would just let them go another week or so, then, by keeping a vigilant eye, start budding and weed out the males, leaving the rest. To me, this makes more sense and helps to avoid an unneeded, potentially stressful situation for them.
Does this sound like a good idea, or it is really a necessity to sex them early on then process?
-AR
----- the back and forth light switch is not good for the plants. If you are only growing the 20 plants out why not wait till they show sex and cull the males out or put them all into flowering and cull the males out when they show signs?DR. VonDankenstine
Well-Known Member
I don't know the answer but I will have it for you in the next couple of days
Bagelthief
Well-Known Member
can you please check my thread about my perpetual harvest? no one seems to be helping. basically my question is, is 4000 watts too much in a 4x8 space if i use co2 and i can keep the temps in check? please see the thread for all the details...thanks.
DR. VonDankenstine
Well-Known Member
A direct answer would be 4000 watts is not to much----but it is overkill and 2-1000's would cover that space and give you rockstar buds with the use of co2 and the correct environment
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Bagelthief
Well-Known Member
Bagelthief
Well-Known Member
well i know it wouldnt be too much, as in killing the plants or anything, but im just wondering if its still efficient. example: lets say with 2000 watts and co2, i can get 1 gram per watt (2000 grams). if i double the wattage to 4000 watts will i still get 1 gram per watt, and basically double my harvest to 4000 grams? or will the efficiency go down?
DR. VonDankenstine
Well-Known Member
Your limited by the growth rate of the plant---Even if all other parameters were perfect more light is only going to be productive up to a certain point then diminish---If you look at the 2-1000's over a true 4x8(measured at the inside diameter of table)----32 squared feet is equal to 62.5 watts per foot. If you doubled your lights sure you could penetrate even the densest growth but the bigger the flowers, the more root mass that is required to support the growth and as you know the bigger the root mass the larger the size of the container you are going to need and the 4x8 room size is a limiting factor as well.---1 gram a watt is nothing to sneeze at-even the most experienced growers strive and struggle to hit that mark. Anything over .50 grams per watt is very good and up to 1 gram is great.
Picasso345
Well-Known Member
I will anxiously await your response.I don't know the answer but I will have it for you in the next couple of days
DR. VonDankenstine
Well-Known Member
Great question and here is the best straight forward answer I can get- the source comes from a plant botanist with over 20 years and a masters in plant biology-------As you know the first two weeks of growth from seeds goes into development of the primary root system-once the the primary root system has developed the plant switches it direction above the ground to rapid vegetative development-to answer your question---yes the loss of the first set of leaves is due to the deficiency caused by the rapid growth of vegetative development after the primary roots have developed-All mobile element are consumed from the lower Set's to maintain and support this growth-but the tricky part is that on would think that you could divert this loss by adding more of the mobile nutrients---(not true) because the plants genetics and hormones tell it to use the store of energy in the first Set's of leaves whether an extra dose of the mobile nutrients are added or not-hence an added dose of nutes will only stack on top of the mobile nutrients the plant is already using from the first set of leaves and would cause an overabundance and as you probley guessed already------nutrient burn. There is no productive way to change this function of the plant but if a plant is topped after the 3rd set of leaves are formed, the hormones within the plant will redirect toward the bottom and the lower leaves will be maintained----As far as production--this would slow all growth down. For practical purposes let the leaves run there corse-their will be plenty of leaves to follow.----hope this answers your question.
DR. VonDankenstine
Well-Known Member
you're looking at about 25 watts per square foot plus the 52 watts of CFL(supplemental). Yes- You will be able to flower with those lights-some growers flower with just small CFL's that are even lower in watts than the CFL's you are using- BUT----a 400HPS would be recommended and give you a lot bigger and denser buds for that size.
DR. VonDankenstine
Well-Known Member
Yes-The leaves and plant can burn from the intensity of light even when heat is removed---I've never personally done a test and I have heard of guys running in the plus range of 80 to 100 watts per square foot without any problems but even the light loving MJ will run into problems at a certain point.