Yellowing, lime green plants

[Dekki]

I dont know what is happening with my plants. They are starting to yellow. I have light mix soil, they are 2 weeks into flowering. NPK 5-25-29. Im giving them EC 1.3, PH 6.5 . Runoff Ec 1.0, PH 6,4-6,5 . Room temperature night/day 23C/26C. When i shifted the food from veg to bloom they started to yellow. I have nutrients in powder NPK 5-25-29, i also add growth/bloom excellarator for immune system. I do like this feed, feed, water. Please help me, i dont know whats wrong with them

 

[Silverfox125]

Looks like they may want some more nutrients high on N. But seeing as how you’re in flower I wouldn’t over do it. Good luck

 

[Dekki]

How do i know that they have improved? Are they gona get back nice green color?

 

[Emilya Green]

yes they will get greener, and they will stop yellowing from the bottom up. This sort of gradual yellowing almost always indicates the lack of a macronutrient...
Since I am a soil grower I do not own an ec meter and I have no idea what your numbers mean, but I would suggest giving more. Checking runoff does not tell us a thing either... this is soil, not coco. I would suggest setting your pH down a bit more to 6.3 so that maybe you can pick up more of the nutrient you are lacking, and then give 50% more food a couple of times to see if you can see a difference. You are not going to know what is up until you change something... indications are that they are not getting all that they need.
You have a lot of plants there... this looks like a very ambitious project!

 

[Canadadoes]

What kind of water are you watering with? Tap water? RO water?

 

[Dekki]

Im using tap water, yea is big project, 3k of them, i will try 50:50 with veg-bloom food to boost nitrogen little bit, and lowered ph to 6.3

 

[Canadadoes]

EC 1.3 is what 650ppm? What week of flower are you in? I always PH to 6.3, but I used RO water so I add cal/mag.

 

[Dekki]

I think 1.4 ec is 900ppm so little less, im in 2nd week flowering. I have everything in 1 feed. Its first time they are yellowing so im new to this problem and dont know how to fix it, i dont want to give them to much food, not to kill them. They are making me to much stress

 

[Emilya Green]

if you don't try something, there will be no change. 900ppm in soil does not sound excessive and as a matter of fact it sounds low. You are not going to harm your plants by trying my advice for one watering... don't be timid... you are growing a weed... a flowering fruiting weed. it is going to need a lot of nutes, especially right now while they are stretching.

 

[Canadadoes]

I thought the calculation form EC to ppm was (EC)x1000 divided by 2 which would put PPM at 700 for 1.4 EC, I could be wrong though.

 

[Emilya Green]

I think I know what may be confusing you. If you are going by EC, you are probably following a hydro guide instead of soil. In water based systems it is common to go with very light nutes, because the plants are sitting in the nutes full time and don't need super strong solutions of the stuff to be effective.
In soil the rules change. It is traditional in soil to give much stronger concentrations of nutes, and then give water on the next pass to even things out, and give any unused nutes a second chance to be used by the plants.
See if you can find a soil feeding guide for the nutes you are using... one that suggests measuring in TBS/Gallon or ml/L instead of EC or PPM... I think you will find that your numbers change significantly, proving our theory that you are feeding much too lightly.

 

[Dekki]

1/4 of plants looks yellow, 3/4 of plants look like this. I have to much of them to give them differend feeds and take time for each of them. Last round i think i had saltbuild up, and they stoped to grow, till i didnt started to give them fresh water, i lost 2 weeks and the product was very bad. I will give them more nutes next time. You suggest, to feed them more and then water, like feed, water, feed, water? Thank you

 

[Dekki]

I thought the calculation form EC to ppm was (EC)x1000 divided by 2 which would put PPM at 700 for 1.4 EC, I could be wrong though.

this is for USA, EU EC to ppm is little bit more diferent calvulating system, we are all the same if i grow in EU and you in USA we are both growing best plants

 

[PE636]

5-25-29 at 2 weeks flowering plus some random "growth accelerators" eh. I suspect the problem is your plants are extremely unimpressed with their diet. I'd go back to whatever your veg feed was and forget about trying to force feed them with bloom nutrients.

 

[Dekki]

5-25-29 at 2 weeks flowering plus some random "growth accelerators" eh. I suspect the problem is your plants are extremely unimpressed with their diet. I'd go back to whatever your veg feed was and forget about trying to force feed them with bloom nutrients.

I was thinking same, probabky high P blocked N, I was more thinking about half veg half bloom feed, or just veg feed, veg is NPK 15-30-15

 

[Dekki]

Thank you all for replays, i learned something new for next round and to fix this one i hope they will get nice and healthy back

 

[Dekki]

UPDATE: the yellowing didnt stoped, still new yellow leaves, they started to claw and some purple leaves and stems. The buds i think are growing normal but the leaves are nerving me. I give them veg nutes EC 1.5 and ph 6.4 . Nutrient ec is same as ml/l as company says. Is it possible i have nutrient lock out or salt buildup?

 

[Emilya Green]

Is it possible i have nutrient lock out or salt buildup?

it very well could be... try doing a 3x the container size flush of a few of them and see how they respond

 

[rippedcb]

In my opinion its a combination of both:
1) Those are some very high PK numbers. You'll def be locking out nutes, especiallly P, that's what the necrosis/black leaves are
2) Just not enough N

so in my opinion, they aren't getting enough food and unable to convert light into energy due to P lockout. I personally would flush and start proper nutrition.

 

[Advocate420]

Is your humidity very low?