Grow details: I Love Growing Marijuana(Robert Bergman) white widow autoflower in 5 gallon fiber pots with happy frog soil 80% perlite 20%. 2000W 3 chip LED in a 4x4x8 tent, plenty of fans inline duct fan pulling air out through a carbon filter. Temps lights on 73-76 Temps lights out 63-65 Water every 4 days every 3rd watering I mix a teaspoon of Neptune's fish fertilizer PH'd to 6.9. I am starting to see Discoloration on the lowest big fan leaves and also working it's way up but still only on the largest fan leaves. This is my second grow same set up only I have been adjusting the PH higher than my first grow. First grow had the same issue only it developed much earlier and more severe all of the plants made it and had a decent harvest but the damage was ugly. Now it is appearing on my second grow but only on the largest fan leaves where in grow 1 it was all leaves. I have been trying to raise my soil PH and have calcium carbonate coming tomorrow to balance my soil which the runoff stands firm at a PH of 4.7-5. It is hard to see the extent of the Discoloration in my pictures but my research leads me to believe I have a calcium problem. Going into week 4 of flower Any advice is appreciated.
can you take the pictures under a more natural light please ,it will help people here who will be able to help .thanks ,,mac.
Yes, natural light would be so much better to see what's going on. and your P H is way off. It should be 6.5 How to Adjust pH When Growing Organic Cannabis Question: What's the Best Way to Adjust pH If I'm Growing in Organic Soil? How do I manage the pH of my soil when growing organically? Young marijuana plant is loving lifeMore info: I've heard that many pH control kits can kill beneficial bacteria in the soil. I was watering my cannabis plants tonight, and I mixed in a half strength dose of bloom nutes. So I test the PH and it is right in range, about 6.5. When I tested the runoff, it was really acidic at around 5.5. What am I doing wrong, and how do I correct pH in my organic soil without hurting the micro-organisms the help the roots? Answer 1.) Usually You Don't Need to Worry About pH When Growing Cannabis With Organic Soil As long as you're starting with a good water source, usually you don't have to think too much about pH during your grow. When growing cannabis in organic soil, you usually don't need to adjust pH, but if you do you want to use natural sources of PH Up and PH Down However, when growing cannabis in organic soil, some of the most important things happen before you even germinate your plants. The more effort you put into starting with great organic super soil, the less you'll have to worry about during the actual grow itself. If you've set things up properly, pH won't be a problem for you! When growing marijuana organically in a super soil environment, there are tiny organisms in the soil that break down nutrients and "feed" them directly to your roots. When you enlist the microorganisms to do the work of making nutrients available to the roots, pH management stops being something you have to do! When growing organically, you also depend on your soil and the various components to automatically buffer the pH. Starting with the right soil will make things a lot easier for you! Learn how to make organic super soil (custom-formulated soil for cannabis plants – for those who want to do organic growing the "real" way and just water their plants, without having to worry about pH or giving nutrients) Unless you are noticing actual symptoms of nutrient lockout (nutrient deficiencies) than pH adjustment is probably not necessary. Don't let your nutrients run out! If you're starting with regular (non-composted) organic soil, than your plants will quickly use up all the nutrients in the soil and you will either have to transplant to new, fresh soil every 3-4 weeks or supplement with a proven organic nutrient line like the GO box. It's especially important to make sure your plant doesn't run out of nutrients in the flowering stage or it will dramatically lower your yields! Once of the cool things about composted soil is the nutrients break down slowly over the course of your grow, giving your plants the right amount of nutrients at the right time. But if you are using liquid nutrients, it becomes important again to make sure you're testing the pH of the water going in and out. Even organic liquid nutrients are only readily available to your plants if the pH is in the right range. But since you don't want to disturb the microorganisms in the soil, try to only actually adjust the pH if you notice pH nutrient problems in your plants. In general with organic growing, it's recommended you do not adjust or try to manage pH until you know something is wrong. In organic growing "if it ain't broke don't fix it." Occasionally you may need to adjust the pH of your organic super soil to ensure the best marijuana growth! 2.) Organic Ways to Adjust pH – For When There's a Nutrient Problem! If you're seeing nutrient problems on your plant, and you know your plant hasn't used up all the nutrients, the first thing to always check is the pH! Check the pH of the water that's going into your plant, as well as the runoff water that's coming out the bottom. In soil you want to maintain a pH of 6-7. If you do notice nutrient problems, the first thing to do is check the pH of the water going in and out! Get a pH test kit on Amazon.com Get a pH tester on Amazon.com Learn how to check the pH of your soil If your pH is outside the 6-7 range, you may need to adjust the pH to avoid further nutrient lockout on your cannabis plants. But since you're growing in organis soil, if you do want to adjust pH, you should use an organic source. Luckily, there are natural sources of PH Up and PH Down, many of which you can actually find around the house! Get Organic PH Down on Amazon - Earth Juice Natural PH DownGet Organic pH Down on Amazon.com - Earth Juice Natural pH DownOrganic "pH Down" •lime •lemon •vinegar •Earth Juice Natural pH Down Organic "pH Up" •baking soda •Earth Juice Natural pH Up Note: Dolomite Lime acts as a natural pH buffer and will help keep the pH constant when added to your soil during the compost process. It can also help correct acidic soil up to a certain point. If you have just realized your soil pH is too low, try to find powdered dolomite lime, as the larger chunks take longer to break down, though be careful that you don't add more than instructed, lime is "hot" (has relatively high levels of nutrients) and can burn your plant in too-high doses. The larger chunks should be okay if you're just looking for a pH buffer. Using an inorganic pH adjuster (like the pH Up and Down that come with most pH adjustment kits, for example the General Hydroponics pH kit) may actually damage your microherd (beneficial bacteria) and can set your marijuana plants back as far as nutrient breakdown / absorption is concerned.
i grow in a Levingtons potting mix and i add perlite to it ,ive never ever pHd water or run off and never had any trouble ,reckon the water what i get straight from tap must be ok ,,,mac,.,
I have been reading a lot about this issue with fox farms products they claim to balance their soils at 6.5-6.9 but what people describe as lockout from low PH always happens if they don't adjust it prior to planting. Like I said it happened on my first grow as well only 3 weeks sooner without me raising the PH. The worse looking one is lowest and the better they look the higher up they are. It is also all located on one side of the plant.
Yep it does look like a pH trouble by looking at the leaves ,,heres a picture of leaves with pH damage it may help decide whether you have the same trouble ,,,mac,,
This is my last bag of happy frog and then I will be switching my planting mix. I was able to get the last plants to finish through this issue but it's just extra work. I watered with 2 teaspoons of calcium carbonate per gallon and put a couple gallons through each pot and PH runoff went from 4.7 to 6.8-7. The plants appear extremely healthy minus this issue I hope the PH adjustment works. Side note I only use organic PH amendments I know people have said I messed up my soil using chemical PH adjusters. At this point I think I just have a soil that is not right for what I'm doing.
For anyone that comes across this thread my plants have recovered nicely most of the oldest fan leaves were lost to the damage but all of the smaller fans near bud sites are healthy. The problem was a major phosphorous deficiency caused by low PH making phosphorus unavailable to my plants. The corrective action I took was simple I mixed 2 teaspoons of calcium carbonate per gallon of water and gave each plant 1 gallon of the mix. This put my soil PH just under 7 the problem progressed for another 3 days and has now stopped and flowers are growing rapidly. I learned not to trust a soils PH rating, test it yourself and Phosphorous deficiency will not show up until your plants are in full flower.