A little help please.

Any ideas? They are sour diesel cross that's 27 days into 1212. The temps are 73° in the day and 68° at night. Humidity stays around the mid 40s. 5 gallon pots. Promix. Advanced nutrients lineup. Feed every water at 1/3 strength. Water once every 4 days or when they seem dry. Great air flow. Two 1000 watt hps about 18-20" above tops. I keep ph input between 5.9-6.3. definitely not a noob but i know enough to watch for problems and ask for help when needed. I will admit they were pretty damn dry today. I noticed a slight yellowing a few days ago. I keep nitrogen in the mix until the end of week 4. I just use less and less every water. Also each plant gets around 3/4 a gallon of water each time. Thanks.

Not really sure if I've got a deficiency or another problem. I did seem to notice that the plants that are most affected where the ones in the lights "hot spots". Where the lights didn't seem as bright the plants still seem green. So i raised the lights up a few inches seeing they are brand new bulbs. Also there are a few red stems I'm noticing also. Any help is greatly appreciated guys.

Red stems look bad ass right? I love a great purple/Red stemmed monster! Some strains, actually quite a few start pumping out the red stems. I've got some nice pics of my Kotton Kandy Kush if you want me to throw some up . Their stems are turning purple and red and a hint of blue. Other wise it's pretty normal unless you have severe yellowing and dry crispy spots and purple or red running down into the leaf veins. Then this would suggest deficiency. As for the yellowing... Your growing mix has no nutritional value so you have to add it . You are adding much less then the recommended use so I would say up your N and add a little cal mag to the mix and you should be golden.

Thanks for the input! I do seem to notice red stems on this particular strain every time but mixed with the leaves I thought there may be something wrong. Also it's weird how they are yellowing from the tips in and from one side of the leaf to the other instead of just the whole leaf yellowing at the same time. I'll keep an eye on it and post results.

Jimmy Sparkle said:

Red stems look bad ass right? I love a great purple/Red stemmed monster! Some strains, actually quite a few start pumping out the red stems. I've got some nice pics of my Kotton Kandy Kush if you want me to throw some up . Their stems are turning purple and red and a hint of blue. Other wise it's pretty normal unless you have severe yellowing and dry crispy spots and purple or red running down into the leaf veins. Then this would suggest deficiency. As for the yellowing... Your growing mix has no nutritional value so you have to add it . You are adding much less then the recommended use so I would say up your N and add a little cal mag to the mix and you should be golden.

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Nice to see a fellow grower that knows