Small bright yellow spots

Hi,

Any idea what might be causing these yellow spots? There are some small bright yellow ones but many of the leaves are also yellowed but lighter yellow and mixed with green. I see no insects and have been using Aptus and Bud A & B. This is about 2 weeks into bloom.

I'm using coco for the first time and have been watching the pH & PPM, the average PPM is about 1100 and the pH is between 6.2-6.5

Also, there is a whitish area on the top of the coco fiber in some spots, not much and seem like it is only on the very surface. This might be normal with Coco, I've always used soil, before.

Thoughts?

Thanks.

I grow in coco and this is not normal.
Are you supplementing with calmag or some sort of calcium supplement? This is a must when growing in coco. And I mean a lot. I put more "cali magic" calcium nutes in than anything else or I get leaves like this. Up to 3.5 ml / gallon depending on plant life stage.

Thanks for the reply. I just started adding calmag, I don't want to burn the plants with too much nutrients. For instance; the 2nd week of bloom gets .8mg fascilitor, 9 ml Bud A & 9ml bud B, .8ml bloomboost, 1ml peakboost, 2ml massboost and 1ml ecozin per gallon.

I've been concerned that the whiteish layer might be excess nitrates drying up on the surface and crystalizing.

I've been concerned if I add calmag to what is already going in there, I'll be way over the accepted PPM.

Megalomando said:

Thanks for the reply. I just started adding calmag, I don't want to burn the plants with too much nutrients. For instance; the 2nd week of bloom gets .8mg fascilitor, 9 ml Bud A & 9ml bud B, .8ml bloomboost, 1ml peakboost, 2ml massboost and 1ml ecozin per gallon.

I've been concerned that the whiteish layer might be excess nitrates drying up on the surface and crystalizing.

I've been concerned if I add calmag to what is already going in there, I'll be way over the accepted PPM.

Click to expand...

I think this is your problem. Those spots look mighty familiar to my first grow when I discovered it was a lack of calcium. Coco is completely nutrient deficient, while soil is not. Soil has the calcium and magnesium the plant needs already in it. Coco does not, you NEED to supplement with calcium/ magnesium. Lower your nutes a certain percentage to allow for at LEAST 2 mL of some sort of calcium/ magnesium supplement (cal-mag is most common, I use cali magic.) Trust me, this is the KEY to growing well in coco. You will be awestruck by the speed of growth and size of buds once you get those nutes just right.

I hear what you're saying. It's a dilemma; either I cut back on nutes and add cal mag to keep the PPM correct or, I add more water & use deionized to cut back on PPM. Tough call.

& thanks for the reply

Megalomando said:

I hear what you're saying. It's a dilemma; either I cut back on nutes and add cal mag to keep the PPM correct or, I add more water & use deionized to cut back on PPM. Tough call.

& thanks for the reply

Click to expand...

No problem. Let me reiterate though that a calcium/magnesium supplement in your nutrient solution is an absolute MUST in coco. It may grow without it by getting by on the tiniest bit that's in your tap water or other nute solutions, but it's not enough. You will have hollow stems and problems like this forever if you don't add that trying to grow in coco.
You also must pH to 5.8 for best results. Very similar rules to a hydroponic grow.

add the cal-mag, forget the ppm

if you dont let your ph fluctuate between 5.8- 6.5 you will lock out CA and MG
The white stuff on top ot the coco is dried up nutrient solution that has turned to salt, thats what happens to your roots when let your coco dry out too much, they get covered in salt and prevent the uptake of nutrients