Root temps b4 nute lockup?? Anyone know??

Does anybody know what the temps should be for healthy root growth in soil? My plant SEEMS to be locking out it's food and the only thing I can figure is that the soil is too cold and it's locking out the "K" ferts. It's not a PH issue or overfertilization. Leaves curling down and very light green over most of the plant. Check out the pic.

Anyone have a clue about this one?

looks like could be underfert-dont see any K issues going on. Ideal soil temp above 55 and lower than 75

I concur that nute lockup happens below 55f. But I think your plant has an Iron deficiency. These are common during the first few weeks of flower. I like "Bonide" Liquid Iron. You can get it for $10 a half gallon at most nursery's. Your hydro store probably won't carry it. Foliar feed the underside of your leaves with 1/4 tsp per quart sprayer bottle once or twice in a week and you should notice an improvement.

smokeybandit22 said:

looks like could be underfert-dont see any K issues going on. Ideal soil temp above 55 and lower than 75

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Thanks for the input bro. An underfert of what though? What's gonna cause the tips to bend down and most of the leaves to turn light green if it's not needing "K"?

THseaman said:

I concur that nute lockup happens below 55f. But I think your plant has an Iron deficiency. These are common during the first few weeks of flower. I like "Bonide" Liquid Iron. You can get it for $10 a half gallon at most nursery's. Your hydro store probably won't carry it. Foliar feed the underside of your leaves with 1/4 tsp per quart sprayer bottle once or twice in a week and you should notice an improvement.

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Yeah, Iron deficiant? Alright, I'll give it a shot tomorrow. How long does it usually take to see results after foliar feeding with the Bonide?

Lightly foliar feed the underside of the fan leaves just before the lights go off. You don't have to douche them, just lightly mist. Wait 2 days. If you don't see improvement, repeat. You should definitely see improvement within 2 days of the second application, or you've got PH problems or hard water(ppm=200+) or something else causing lockout.

Antman said:

Thanks for the input bro. An underfert of what though? What's gonna cause the tips to bend down and most of the leaves to turn light green if it's not needing "K"?

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I think Seaman's got ur number

Potassium def looks completely different than what you have going. When the tips of the new growth turn yellow/light green it is an iron(fe) def. If the tips of your old growth were to be turning yellow it would be Nitrogen (n) and if the base of your leaves start to turn yellow working it's way out, it's usually PH related. This is the quick and dirty explanation and there are of course exceptions to most norms. They don't look bad though, I wouldn't worry too much.

Thanks smokeybandit22 and THseaman, appreciate the help guys. +Rep up.