Need help diagnosing nute deficiency

[Gitane]

Indica Hybrid (Pluto) Week 4 flowering in 15 gal soil (premium organic planting mix)
Using Earth Juice 5 bottle line; Yellowing first appeared on outer edges of leaves 2 weeks ago. I've given it additional Meta K an Micro blast(1 tsp each/gal.) Adjust PH water to apprx 6.2
Yellowing is still progressing. No interveinal yellowing. Magnesium deficiency? Potassium? Iron? Do I add more of these nutrients? At what concentration
Any advise appreciated.
Thanks

 

[iboxweed]

Re: Need help diagnosing nut. deficiency

I would try a good flushing to start and keep it simple with one quarter of fert you are using. for a couple of weeks than half strength. I would think your soil was good enought for four weeks to start. My 2 gal. plant pots work well for me and space for a small closet grow. keeping my lights away from that burn.

 

[11 Bravo]

Lightly flush and cease the use of any nutrients. Check your PH and if all is good start them back on 25% nutrient strength after a week or so of watering pure water. There may not be much of a need for fertilizing if theres still enough residual left in the soil after a light flushing. Ya never know though. What works the best for me in a situation like this is STOP doing everything except watering and give them a week, watch them and go from there. I do think this is some form of overdose/burn from excess nutrients.

 

[budstud]

Your plant is expressing a Mg deficit from over fertilizing. One should always check run-off in soil and ascertain whether your ph has dropped? In this case, your ph in the root-zone is low, probably well below a ph for optimal growing. The first deficit to show are Mg and Ca. Follow previous advise from members, and check out this chart. https://boards.cannabis.com/attachm...sted-leaves-some-tips-curled-down-phchart.jpg Notice how the chart reveals a low end deficit when ph drops to 6.4

 

[Gitane]

thanks. PH on tap water is 7.0. Will that raise the PH level of the root zone?

 

[budstud]

thanks. PH on tap water is 7.0. Will that raise the PH level of the root zone?

I've helped some folks with the root-zone ph was so low that it didn't matter how much water they run through @ 7ph, it simply wouldn't help. Some folks over fertilize and never check their run-off, then, find it's too late when they notice the damage.