Nitrogen deficiency?

[pegz]

Generally a seedling is not going to start turning yellow if it doesn't get fed for the first few weeks of its life. This is something else, possibly overwatering.

Edited September 12, 2013 by pegz

[gorillagrowa]

Went well for a week until yesterday I noticed this, spent the whole day out in the sun yesterday, came home and all six have brown new growth, flushed them with ph'd water but no change this morning. I'll give it another day and if they turn yellow I'll treat it as sulphur def yeh?

 

Here's one pic, they're all the exact same

[The Hash Nibbler]

What soil are ya using? just outta the garden, or a potting mix? If its a mix or from garden and had added fertilizer may be your problem. Plenty of people have problems with seed raising mixes and Canna.

 

nibbler.

[gorillagrowa]

Organic composted mulch, bought a bunch of bags to top my gardens with but it's nothing like mulch at all so mixed it with perlite chucked it in pots

[The Hash Nibbler]

Well theres part of  ya problem right there...... next time try coco, and use a coco nute or one suitable for coco. Hope that helps. Nibbler.

[gorillagrowa]

Would coco suit a bush grow? Might go out and mix more of the natural dirt into the plots if I'm having problems like this already

[gorillagrowa]

Still having issues guys, girls are growing, fast enough for me to notice daily growth but...

 

These two are looking pale, more N?

 

This ones got more of that brown new growth plus some curling of the lower leaves and with pales tips

 

This one is covered in brown spots yet that fourth set of leaves wasnt there two days ago

 

These two are starting to get the brown spots aswell plus the lower leaves are curling pretty bad

 

Been feeding 1ml/L powerfeed and 2ml/L seasol ph'd to 6

Run off ph has been 6.5

I've got to the point of weighing the pots to avoid overwatering

Today was water day, no nutes, schedules been 3 feeds with nutes one without

 

I'm thinking the top two could do with some nutes and flush the rest

 

Advice?

[pegz]

Spots look like minor nute damage, it's nothing to worry about. Not sure about the colour, how often are you feeding em? Those pots are big for the plants, they shouldn't need to be watered/fed more than once every 5 to 7+ days, even under a HID.

[ethnoman]

Have you changed the media yet? Commercial composts from gardening stores is not what you want to be using. It's mostly pinebark and not even fully broken down at that.

[gorillagrowa]

 

This is the same plant from pics 4 and 5 from the above post, that's some substantial growth in the past 12 hours

 

Gave the top three plants same nute schedule as mentioned before, flushed the bottom three

 

Pot size. While repotting the bottom three with added perlite to help with drainage I damaged the roots a bit which stunted their growth, so the next week when I repotted the top three I went with bigger pots so I didn't mess with theirs.

 

Watering. Like I said I'm weighing the pots, with the top three they get 1.5L with about 20% runoff so once they're a kilo lighter I feed, about four days. The bottom three in smaller pots take .5L with 20% runoff so I feed when they're about 200g lighter, every two days.

 

Definately choose an alternative medium next year but I'll have to struggle through te mistakes I've made so far, I'll give them an extra 2 days between feeds and see how we go

 

Thanks guys