Nutrient deficiency or overkill? + Temp Question

[lucasnooker]

Yo growers,

So my plants are doing pretty well right now besides the middle one. hopefully you can see from the pictures but there seems to be some yellow tips on leaves, burn marks and slightly pale leaves towards the top of the canopy. also there are a few leaves further down that are either curling downward or curling to the left for some strange reason. am I overfeeding or under feeding? because the other plants seem to be doing great although they are much bigger.

Also I am at the point now where I am going to start flowering and as you can see my sativa dominant strain (trainwreck) is pretty huge in vegetative growth compared to the rest and I am wondering how big in size this strain will get to when it comes to the flowering period as I only actually have about 5 - 6 ft of height to work with and its already going past 2ft. and my temps are going to struggle significantly soon I fear. the tent is set up in a very cold room and is fine when the lights are on but the temp regarding the dark hours all depends on how warm it is outside with the natural weather. during vegetative growth I have been transferring the plants to another room in the house during their dark cycle which is all fine as of now because there is no smell. but as of next week I am going to have to keep the plants in the tent and at night the temp can drop as low as 12 degrees C which is no good for the plants and will in turn give me much less yield if it is persistent, correct? so what would you recommend I do to fix this issue? it only has to raise a few degrees.

Thanks for your help and input guys, also how much do you think I should be yielding off of these plants if everything is done correctly? I know everybody is going to say "about a pound" but any serious guesses would be much appreciated as I would like to know what I can expect from these plants. This is only my second grow Cheers again people

 

[THCfingers]

Give them a good flush and then the next two watering at 50% nut strength. How much can you expect? well that depends on your light and if you get this under control. if that is a 600w, I would guess 1/2 to 3/4 lb.

 

[ISK]

Yo growers,

So my plants are doing pretty well right now besides the middle one. hopefully you can see from the pictures but there seems to be some yellow tips on leaves, burn marks and slightly pale leaves towards the top of the canopy. also there are a few leaves further down that are either curling downward or curling to the left for some strange reason. am I overfeeding or under feeding? because the other plants seem to be doing great although they are much bigger.

Also I am at the point now where I am going to start flowering and as you can see my sativa dominant strain (trainwreck) is pretty huge in vegetative growth compared to the rest and I am wondering how big in size this strain will get to when it comes to the flowering period as I only actually have about 5 - 6 ft of height to work with and its already going past 2ft. and my temps are going to struggle significantly soon I fear. the tent is set up in a very cold room and is fine when the lights are on but the temp regarding the dark hours all depends on how warm it is outside with the natural weather. during vegetative growth I have been transferring the plants to another room in the house during their dark cycle which is all fine as of now because there is no smell. but as of next week I am going to have to keep the plants in the tent and at night the temp can drop as low as 12 degrees C which is no good for the plants and will in turn give me much less yield if it is persistent, correct? so what would you recommend I do to fix this issue? it only has to raise a few degrees.

Thanks for your help and input guys, also how much do you think I should be yielding off of these plants if everything is done correctly? I know everybody is going to say "about a pound" but any serious guesses would be much appreciated as I would like to know what I can expect from these plants. This is only my second grow Cheers again people

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yeah, they look not bad, but I think you are giving too much nutes by the looks of those burnt tips

I hope you are only using nutes every 2nd or third watering...does your soil also have built in nutes?

12C (55F) is on the cool side, maybe an electric heater to keep the temps no lower than 17C (65F)

 

[lucasnooker]

yeah, they look not bad, but I think you are giving too much nutes by the looks of those burnt tips

I hope you are only using nutes every 2nd or third watering...does your soil also have built in nutes?

12C (55F) is on the cool side, maybe an electric heater to keep the temps no lower than 17C (65F)

I am actually growing in coco coir so I am feeding every day. I am going to feed 1 more time tomorrow and then give them all a good flush out to get them ready for the flower period this weekend. I thought about an electric heater already but I was wondering if there were a more cost effective option as I'm using plenty of electric as it is lol. and yes I am indeed using a 600w HPS. just gotta get my temps under control for the flowering in the night cycle. I hear anything below 15 is pretty bad for bud production so I could do with a solution of resolving this issue by the weekend because I am planning to switch the lights to 12/12 on friday/saturday

 

[Smootherpete]

Those plants are shiny green, they are suffering from N toxicity. Are you using Cal Mag? If you are, cal mag is an extra dose of N when you add it to the mix. My advice is lower your feedings by a lot, after the initial flowering stretch, you will have problems if you don't. For my coco I do 2ml A + 2ml B(Canna Coco nutrients) +1ml CalMag per 2L coke bottles.

 

[lucasnooker]

Those plants are shiny green, they are suffering from N toxicity. Are you using Cal Mag? If you are, cal mag is an extra dose of N when you add it to the mix. My advice is lower your feedings by a lot, after the initial flowering stretch, you will have problems if you don't. For my coco I do 2ml A + 2ml B(Canna Coco nutrients) +1ml CalMag per 2L coke bottles.

I'm actually not using cal-mag. just foxfarm brand of nutrients and following the hydroponic feeding schedule on site seen as it is coco. the measurements are for us gallons though but it converts to about 1 teaspoon of veg fert to 1.5 L coke bottle. but I give them all just over 2L a day so they can have a 20% run off. but I will flush the plants out and lower my dosages once I get into flower any advice for raising temps in flower room during dark period?

 

[Smootherpete]

I'm actually not using cal-mag. just foxfarm brand of nutrients and following the hydroponic feeding schedule on site seen as it is coco. the measurements are for us gallons though but it converts to about 1 teaspoon of veg fert to 1.5 L coke bottle. but I give them all just over 2L a day so they can have a 20% run off. but I will flush the plants out and lower my dosages once I get into flower any advice for raising temps in flower room during dark period?

Maybe for the 12-12 cycle you can setup your timer to be on at night during the cold hours to help keep temps somewhat constant. Get and electric heater as a backup if you don't have baseboard heaters. My 600w heats up the room it's in nicely during winter. It helps to have a small room...less heat needed in winter, less cooling/AC needed in summer.