Originally Posted by Snypie
OK, thank you. I sprayed them and raised the lamp. When the leafs are dry i will lower it again. Can i do it again tomorrow?
And please lets talk about the nute strength. So my tap water is 0.5 EC (or 260 ppm). I add nutes (400 ppm/ 0.8EC?? is this enough or strong) till 1.3 EC (660 ppm) + 0.3 gr/liter Epsom. Or the Epsom is in the total 1.3 EC?
I hope you understand what i want to ask.
Hi snypie, lets see if I can help you get on the right track. You can do many different approaches, but ill share with you what works for me and some fundamentals of why. Im going to cover a few basics that you may have well under control, or maybe not, that could cause or exasperate this problem.
First, make sure you have adequate air circulation. All leaves should be lightly moving, but not turbulent. No stagnant spots in the grow area. Second, your temp and humidity should be relative to each other to meet the best vpd. So if your running 80f, in veg, then 70 to 75% is best. If its 30%, or lower, your definitely exasperating the problem. Make sure your light and bulb are performing correctly.
Not all coir is equal, not even the same brand from bag to bag. that's why some people can water daily form the start, while others drown their plants. That, and different environments.
Now lets discuss water frequency. Never let the coir get to the dryness it came out of the bag after putting a plant in it. That, imo, is where the bulk of your problem started. I like to shoot for
about 30% moisture from the original bag dry starting point, before watering again. When I use perlite mixes, I almost always can water the next day. When I use straight coir, if the plant is slow, or I transplant into a bigger pot, it sometimes takes another day before they get to that 30% moisture dryness again. It usually takes 2 to 3 water cycles, or 3 to 6 days before the plants feel too light the next day. this is again where you can start a problem from drying out too much. Now its imperative to water daily and if they get bone dry you must transplant soon, or set up to water multi times, or the constant over drying will cause the nute build up, k tox, mg/ca def, basically everything.
Now lets talk nutrient strength. Im a believer in any decent nutrient line that gives you the correct ratio. Basically, almost any made for this industry. Ive used heads gh 6/9 with great success, but switched to jacks, for cost and to get away from gh's parent co. Plants only need 1 to 1.2ec of base nutrients period (disclaimer, from my experiences of running a lot of elite cuts and seed lines). I learned this nutrient strength concept from h3ad, heath robinson, and a few others. Don't waste your time looking at my work, just take a look at those guys work. It pretty much ends most of the speculation.
Now the reason you want to use 1 to 1.2ec from the start is because of coirs cec. In a nutshell it likes to release k and na, unless its has enough ca and mg to balance itself. That's why its important to start with low ec coir. Instead of feeding a higher ec, just increase your water frequency. this replaces the stagnant water, air, and used imbalanced nutes from the last watering, with a perfect ratio and strength of nutrient, with fresh air as an added bonus. Voila, now we are treating it like hydro, and getting that fast vigorous growth we want.
Your tap water, im no expert here. I use ro water. imo, if using a good nutrient that meets basic nutrient profile for coir, then 1 to 1.2ec being enough food, I don't like the idea of adding .5ec of things that could alter the ratio of base nutrients. If you understand your tap analysis and it fits in the correct ratio for cannabis and coir then go for it. A safer approach I would do is to only use half or 1/4 tap to ro water. But the base premise is this for nutrient strength, tap/ro water ec, plus 1 to 1.2 ec base nutrients, plus whatever additives. The key is the base ec being the same strength. Im not a believer in using Epsom in coir, but if u do, keep it low strength as per suggestions.
If you choose to use additives, I wouldn't use any that mess with your base, npk/ca/mg ratios. If you want to use a bloom booster, Keep it at .2ec or lower, and reduce your base to .8 to 1ec, for lighter feeders. But as soon as your in coir, seed sprout or 5' tree, 1 to 1.2ec, all the way through works well.
I understand your going for no waist, but until you get more familiar with your medium and nutrient, id recommend some run off.
Make sure your environment is in check per my suggestions. temp/rh/air circulation
Check that bulb. Change, clean, clean lens.
Now, the biggie, imo, water to runoff with base nutes at 1.2ec, 5.8 to 6 ph. Wait for plant to get to 30% of original driest weight. then water to run off again. After 3 to 4 water cycles (3 to 6 days), they should be dry enough to water daily. when they dry too much within 1 day, then drip. I use open end drip line, usually starting at 4 times a day, then up to 6 to 8 in flower. That all depends on how they are drying, and what size pots your using per plant size. Some strains, may not like that many waterings. I keep an eye on run off ec. don't pay attention to run off ph imo. If the ec goes .4ec above what im feeding, I up my feed frequency or my duration of feed, to compensate for the plant drying too much between waterings, causing the run off ec spike.
Get all this together and your plants should be chugging along in a week or two. gl, hope some of this helps.