Yellowing and Browning under 400HPS, help please.

I recently moved my 2 plants over to our flowering box.

Im using a 400W HPS 2 fans for circulation and 2 bathroom fans to suck the air out.

Temps get to about 84F max in the daytime while it is closed.
With my hand under the light, it does not feel hot and I can surely withstand it for long periods of time.

Im using a Autopot system that waters from the bottom from a reservoir. Many people dont like this method but it has worked well for about 2.5 months so Im going to stick with it for flowering unless I change my mind soon.

I have noticed that even before I moved my plants from the veg box (125w cfl) that the OG Kush was already yellowing towards the top because it was quite close to the light. The greener one in the pics is my Haze plant.

So my question is... why are the tips browning and curling? Water should be fine. Please let me know I have included pics. Nutes were added about 2 days ago. Using Botanicare Pro Bloom.

hi looking at the purple stock tells me the roots are locked up im growing in dirt and one day the stocks took off turning purple i did not trip till all the bottom leaves started turning yellow i trans planted and all was good not sure how that will help you but cant hurt. did you change fert or dose? when you noticed the yellow in the vedge room did you back off on the fert? its such a fine balance to find.

looks like a nutrient or ph issue

smokencron said:

hi looking at the purple stock tells me the roots are locked up im growing in dirt and one day the stocks took off turning purple i did not trip till all the bottom leaves started turning yellow i trans planted and all was good not sure how that will help you but cant hurt. did you change fert or dose? when you noticed the yellow in the vedge room did you back off on the fert? its such a fine balance to find.

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huh? by "stock" do u mean stalks? because my stalks have always been purple since they were small. but i will check tomorrow and perhaps transplant it into another pot and get rid of the autopot right now for flowering. thanks for the info.

i barely even put nutes in, and i even put half of the recommended amount for now. the leaves were like this even before i put nutes in.

as for it being a nute or ph problem. it may be pH because nutes were introduced like 2 days ago like i said and it happened before the nutes. i was hoping the nutes would help it.

Nute burn
PH problums
heat/light burn
not enough moving air
heat stress

i,m interested if this is a root bound coz my plant's leaf stems on the older leafs are purple too. and they are yelowing too, but not a real big deal . i guess that's because i'm in the 6-th week of flowering and it's normal for the leafs to die. all the other leafs except the older ones are looking green and perk on my plant....not like yours . i think it's nute defficiency (phosphorus) . that's just my opinion

i transplanted today and yeah they roots were locked up. got a 14in pot and we will see how that goes. thanks for the info guys.

sounds similar to my problem. i tried upping the phosphorus but that didn't help. i'm going to switch pots. thanks for the help