Leaves curling upwards and slight yellowing

Hi,

Plants are 2 weeks old in John Innes No.1 compost. Not been given any nutes yet.

The leaves on all the plants are slightly curled upwards, some worse than others, and one of the leaves on one plants is starting to yellow.

Anyone have any idea what could be causing this? I thought it might be from being too close to the light, but i'm slightly doubtful now as they have been not that close..

Any help would be greatly appreciated

What kind of light are you using and how close is it? Have you checked your pH? I find that a LOT of problems are related to the pH being off. You should be watering with pH 6.5-6.8 water.

Antigen said:

What kind of light are you using and how close is it? Have you checked your pH? I find that a LOT of problems are related to the pH being off. You should be watering with pH 6.5-6.8 water.

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actually very few problems are ph related in soil

using a 250w veg cfl at the mo, they were about 3 inches away now i'd say about 2 - 2.5. Haven't checked the ph, the ph tester i got was bloody useless but it was for soil anyway. I may buy a ph meter tomorrow, can a soil one still read the ph of water?
Been watering with ph 6.2 bottled water, which we are gonna use only from now on, and tap water. Would 6.2 be ok do you know? I'll include a pic of the water label.

I'm wondering if the it's magnesium deficiency as the symptoms look similar to what i read, but i would of thought there would be enough mg in the soil. I'm not even sure when to start using nutes as the soil contains some (got another post asking about that lol)

edges of leaves curling up is most likely too much water. let them dry out for a few days till the soil cracks and start fresh

If your pH is 6.2 or lower, that could be causing Magnesium to get locked out. Even if there is available Magnesium or you are giving it supplements, it won't be able to absorb them. And I'm not sure what that means about pH being 6.2 at the source, but I wouldn't just trust what the bottle says. You need to buy a meter or a test kit and measure what it is right before you put it on your plants.

Also that bottled water has a lot of stuff in it like sodium that you shouldn't be putting on your plants. It will start building up contributing to further lockout of nutrients. I would just use your tapwater, let it set out for 24 hours to burn off Chlorine, and then use pH UP or pH DOWN (you will probably need down but you should buy a bottle of both up and down) to make sure the pH is between 6.5 and 6.8. You will have to buy a meter or the colored test drops of course so you can measure your pH.

So it could be over watering, ph problems, too much nutes or too little nutes.. Shit

I'm buying some bio grow and root stim today, but i really don't know if i should add the bio grow yet.. it could help or could make things worse..

I don't think it is too much nutes since you haven't fed them any yet. If you're going to give them any food, make sure you only give like 1/3 the normal dose or less, so you don't burn them on their first feeding. You should slowly work your way up to full dose feeding.

Don't give them any more of that bottled water, and make sure you start measuring and correcting the pH of your tapwater before you give it to them. When you start adding fertilizers to the water it will lower the pH, so you need to make sure you check it and adjust to the proper level.

We've fed them low doses of bio grow and root juice, gonna go have a look at them today see if there is any improvement, We've also started pH correcting tap water and using that.

Cheers for the advice