Plants showing some symptoms, What can it be?

My plants are 4 and a half weeks into flower. The temps lately inside it have range from 60-81. When it's 60 degrees, it isn't that for very long because my dehumidifier turns on and warms up the tent(after my lights turn off there is a little delay for the dehumidifier to turn on, so it drops this low for probably ~30 minutes). Humidity ranges from 30%-60%, but again it only gets to 60% for like ~30 minutes until the dehumidifier turns on; otherwise it is usually around 35-45%. My lights are about 2' above the canopy. I'm running three 600W HPS in air-cooled hoods. Not sure what these are symptoms of. I've only been watering like once a week(the pots just don't dry out fast enough!), but when I do water I give them a packed meal. Some of the pics I think are just old leaves on the bottom dying off, but others, like the mid to top leaves, I'm not sure what this type of yellowing is from. Let me know what you think.

Well I see some straight up nutrient burn, but there also looks to be a slight pH issue. What are you feeding it and whats the runoff pH? Or are you checking any of that?

Agree with Bucees, (pretty severe) nutrient burn. Back off on how much you are feeding them and see how they respond. Could be Ph too. Are you PHing your nutrient solution? Backing off on the strength of your nutrients could somewhat help the Ph issue automatically as well. I hope you put some dolomite lime in the soil mix.

I think you are packing their meals too much. Agree with both responses above. Back down on the nutes and watch you pH.

Bucees said:

Well I see some straight up nutrient burn, but there also looks to be a slight pH issue. What are you feeding it and whats the runoff pH? Or are you checking any of that?

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Thanks for the input. I use an all organic nutrient line called Nectar for the Gods. I haven't checked PH of my run-off :/ i don't get too much run off and when I do it's hard to get enough to test the PH, but I'll try that next watering. I had a feeling I was feeding them too much because I only water like once a week, I've been trying to pack em with nutrients, but I'll lay off on them now. Do you think I should not use any nutrients on my next water or just do a light feeding or a bonemeal flush? I'm thinking about a light feeding because I only water every so often.

ghgou812 said:

I think you are packing their meals too much. Agree with both responses above. Back down on the nutes and watch you pH.

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I usually PH around 6.4. I think it's nutrient burn; I have been feeding them really heavy(too heavy I guess) because I only water once a week :\

Should have asked earlier, but what kinda medium are you using?

Bucees said:

Should have asked earlier, but what kinda medium are you using?

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I'm using Coco Connoisseur Premium Soil Blend. It's 70% coco and 30% peat moss. I reused it from my last run. I soaked it in water with enzymes to break down the roots, but I soaked it too much to the point that after I transplanted my teens into the wet reused soil I didn't water for THREE WEEKS! Now I'm watering about once a week :\

Your medium not drying usually means either the pot is too big for the plant or the root system isn't developed. Something to keep in mind for your next grow. I grow in 3 gallon fabric pots. After some experimentation I found that 2 gallon fabrics dry up too fast and 4/5 gallons are just too large to be practical. Seems that 3 gallons was the sweet spot for my setup. I feed them every other day at which point they are getting pretty light but not dry.

Anyways I hate to say flush your plant out because it takes so long for your pot to dry. If you were to flush with plain water there is always a chance for root rot. I guess if I had to recommend something it would be to let it dry up as best as possible and next watering drop it down to 1/4 strength or plain water.

Bucees said:

Your medium not drying usually means either the pot is too big for the plant or the root system isn't developed. Something to keep in mind for your next grow. I grow in 3 gallon fabric pots. After some experimentation I found that 2 gallon fabrics dry up too fast and 4/5 gallons are just too large to be practical. Seems that 3 gallons was the sweet spot for my setup. I feed them every other day at which point they are getting pretty light but not dry.

Anyways I hate to say flush your plant out because it takes so long for your pot to dry. If you were to flush with plain water there is always a chance for root rot. I guess if I had to recommend something it would be to let it dry up as best as possible and next watering drop it down to 1/4 strength or plain water.

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I'll try the 1/4 strength. And i use 3 gallon fabric pots as well. My last run I didn't have the watering issue; 3 gallons seems perfect. This run though, my problems all stemmed from when I soaked the soil in enzymes to break down the old roots and soaked them too much...From there they didn't get enough nutrients to develop and I'm on a tight schedule(trying to get the perfect amount of runs possible in before my lease is up), so I had to switch them over earlier than I would've like :\

just a medicator said:

I'll try the 1/4 strength. And i use 3 gallon fabric pots as well. My last run I didn't have the watering issue; 3 gallons seems perfect. This run though, my problems all stemmed from when I soaked the soil in enzymes to break down the old roots and soaked them too much...From there they didn't get enough nutrients to develop and I'm on a tight schedule(trying to get the perfect amount of runs possible in before my lease is up), so I had to switch them over earlier than I would've like :\

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Ahh I see. One of those live and learn kinda situations. I've had plenty of those!