SOIL Leaf issues - help pinpoint

[WillGrow]

Greetings, I have several plants presenting issues with both fan leaves and younger leaves. The plants are now one week before harvest, but I'd like to pinpoint this issue!

I have uploaded some pictures.

The plants are watered with a consistent p.H 5.8 range - but I believe there has been some fluctuating here. Lately, they have been sitting fairly damp very regularly. The soil medium is pro mix, I have to yet measure run-off pH as I have heard of other growers having issues in this area.

I have a few ideas myself but would appreciate some extra insight!

 

[Tersky]

First off you said your ph was 5.8 in soil? Soil ph is 6.0-7.0. Second, plants usually go through deficiencies right before harvest as the plants use the nutes from the leaves. That is normal but having 5.8 pH in soil is not.

 

[Rwise]

Pics of the plant would help.
PH for flowers in soil should run about 6.8.

 

[SoOrbudgal]

agreed need full plant photo

 

[Fjeff]

Try this tool

 

[OldManGrower]

What you have is classic nutrient lockout due to low PH. This is combined with normal late stage yellowing. Flush your plants with water PH at 7.0 cal-mag and nutrients.

 

[dilvish]

Your asking at one week to harvest? not much can be done that far off as they certainly won't see fatter buds in a weeks time unless any correction took place overnight.

Personally it looks like light or heat stress as the leaves are "canoeing" and yes, as above 5.8 PH in soil is too low. should be 6.5-7.0

 

[WillGrow]

Thank you for the responses so far.

Rwise I'll have a full picture tomorrow

Fjeff I will give this a try for future purposes, thank you!

Tersky I meant the water is 5.8, not the soil. I may have not phrased it very well in my original post. I still do not have a pH reading for the soil or the water runoff from the plants in question. I will follow up with that tomorrow.

dilvish I'm not looking to correct this issue with the plants in question or achieve anything for yield - simply looking to improve my own diagnostic knowledge.

OldManGrower This is what I suspect. I will need to get some more readings (soil pH and run off before I can offer more info, to distinguish adequately) the younger leaves also look like they are presenting phosphorous deficiency)