Soil moisture that is not absorbed rapidly turns stagnant; the plant quickly uses up any oxygen within the water, then is unable to respire further, resulting in moisture low in o2. Pythium thrives in low-oxygen (anaerobic) conditions.
In short, overwatering will slowly suffocate your roots, preventing sufficient oxygen uptake by the roots, and ultimately causing root rot.
Soil with high bark content
This can cause a "bonsai" effect. The roots will not be able to grow through the bark, preferring to grow around the chunks of bark. This slows down root growth and most obviously plant growth. Ive encounter this recently; once transplanted into proper soil, they have shown remarkable recovery.
[Editor's note: bark is quite acidic, may may afect soil water pH]
Although your plant may be receiving light, particular strains may require higher light levels than others. A recommended light level for full bud development is 50 watts/m2. Full sunlight is 100,000 lumens max.
Low nutrient strength
The plant is unable to acquire the necessary amounts of nutrients to sustain high growth rates. Large and mature plants can take higher nutrient strengths.
Nutrient strength is also related to the light intensity; plants under fluorescent lights usually require a lower nutrient concentration than under HIDs.
Adding too much of a nutrient (ex. Magnesium) can "lockup" one or more nutrients, rendering them chemically unavailable to the plant. Nutrient lockup can occur at extreme pH ranges (ie. under 5.0, over 7.0).
Light that does not contain enough red spectrum (too much blue)
Light spectrum can have a dramatic effect on plant growth, with different ligh frequencies affecting different photosynthetic processes within the leaf. Selecting a blue spectrum in a vegetative growth phase is preferred, with red spectrum in flowering.
pH is too high or too low (ie. acidic soil. The plants come out as mutants).
Plants are unable to absorb nutrients, or in adequate quantities within certain pH ranges. Optimum pH varies with each medium. Hydroponics and aeroponics: 5.6-5.8. Soilless: 6.0-6.3 Soil: 6.5-7.0.
Many soilless mixtures can be fairly acidic, due to their high % bark content.
Plant metabolism will decrease at low temperatures. Chemical reactions within the plant will take longer. Optimum plant growth often requires close temperature regulation; daytime temperatures between 25C and 30C are preferred. Differences in daytime and nighttime temps should not be dramatic, as this difference may shock the plant.
Low soil / medium temp
Evaporation from a medium (i.e. peat pots) tends to chill the medium quite a bit due to the evaporative cooling effect. As the peat pot warms, it draws moisture outward, the evap effect cools the peat (like sweating). New growers often make the mistake of adding excessive amounts of water, resulting in cold soil, poor root formation and slowed growth
I believe the answer is yes. They have to be specific LED though. Not sure which kind though.Will simple LED bulbs do the trick? I currently only have a 69w (3 CFL bulb @ 23w) setup in a space bucket. Me saying this only confirms I'm a newb at growing and all the other things associated with it, but I was led to believe then that the more watts used to light a plant will yield great results. Since LED bulbs provide more power than CFLs with less power consumption, I'd actually stick to them instead---the reason for this inquiry.
Can simple LED bulbs aide in the plant's growth, same with the LED strips?
I have personally never used LED, so I'm not as informed on them as I would like to be. Still learning a lot myself. Hope you find your answer.By specific LED meaning? I can use the ordinary kind of LED bulbs, yes? Or should I mix and match different colors of light?
Thanks for the reply man
Still, thanks a bunch man. I learned a lot as well reading your grow journal and the input all the members've put in it. I hope all your grows are well.I have personally never used LED, so I'm not as informed on them as I would like to be. Still learning a lot myself. Hope you find your answer.
you need to let them sleep some time as they are starting out you can do 18 and a half on and 6 and a half off but they do need air have you looked in to a grow tent and a timer will work good and you just let them grow and depend on how mine you are growing depends on how mine WATS you need i hope i was some helpHi,
7 Bubba Kush seeds from CKS. All popped. Planted in soil, indoors under a ViparSpectra 300 watt LED. They popped up fast once under light, but now two of the seedlings have yellow leaves, and they're all growing slow. Please let me know how I can help them improve....
It's been one week under the LED light - which is about 12 inches above plants.
No nutes. I water them morning and night with collected rain water as they look quite dry.
Temp 68 degrees.
5 planted in jiffy peat pots. 2 with yellow leaves live in small clay pots.
All plants are about half inch tall.
Window in room is cracked during the day for air.
24 hour LED light cycle.
All thoughts are greatly appreciated!
Ok. I am growing 4 plants, two tutankhamen(mostly indica),one AK Kali (mostly sativa) and one blueberry plant, 4th generation (mostly sativa) under 2-400 watt cfl bulbs at 5600k. These plants, except for the blueberry(which is over 6 months old because it is a clone) are about a month old, but they are only several inches high. They are all in Happy Frog soil, with a small amount of vermiculite (about 20 percent). The blueberry is in a 6 inch pot, as is the AK Kali, and the other two are in three inch pots right now, but are going to be transferred to 12 inch pots. I use PH Perfect fertilizer, a three-part fertilizer which is excellent. Right now, I am using about 1 ML or less per pint of water, and I am adding a terpene mix, along with a small amount of blackstrap molasses. The problem is, they are growing so slowly. They should be at least 6 to 8 inches by now (i'm talking the three plants, not the blueberry, which is already about 8 inches tall), but are only a couple of inches tall. The stems are fairly thick, and I keep the light about two inches above the two tut plants, and the ak plant is in the middle, with the blueberry on the other side, getting the other light. Is there something I can do to make these plants grow quicker? Do I need to add more light? The problem is, even with a fan directly overhead, when the door is closed, the temperature goes up to 90 degrees. With it open (and the air conditioner on), it is around 72 to 75 degrees. I leave it open most of the time, except for about an hour in the morning before I crack the door open on one side, which lowers the temp to around 80 degrees. Can someone help me out here, or am i just wasting my time?[/QUOT you have to bring the outside in your room gets way to hot if you are using c02 then you want it about 85 degrees but not at the age i am willing to help you blueberry is hard to grow right off the bat so i am going to give you some ideas here is one bananas pills is a good place to start you and another place to start is when the lights are on it should get about 75 and when the lights are off then it should get 73 no lower then 70 and the lights you i dont know about the lights i need to know what lights you are using and the light should have a fan on it ore something to keep the air going around and a round there is more in just putting the seeds in something and they grow but i have more ideas for you and blueberry's should take 6 to 8 week to get to there full sises but dont know what kind of blueberry's you are growing but your ak pull them out and look at the roots and see what cooler they are if there are brown there bad sine i need you to look at the roots and get back to me