Tomatoe nutrient problems?

[superman]

My tomato plants have been growing for about a month now after having a black thumb for some time i added some more lights and that seemed to fix my problem and my plants have started to take off root growth is now crazy in comparison to before.

However i think i am have a deficiency in some nutrient, but i cant determine what exactly it is. I am using the receipt for success starter kit for nutrients.
After sometime the top leafs seem to develop little yellow dots. Also some of the bottom plants leaves seem to be quit small (i think this is because there is not enough light reaching them).





Any Suggestions would be great.

Thank You

[GpsFrontier]

I cant say what the problem is off the top of my head but. Though I do know that tomatoes usually require added calcium, and that a lack of enough calcium can look like many other problems so it is hard to distinguish that as a problem. But here are a few links about nutrient Deficiencies and Toxicity that may help you.

Nutrition (this is probably the best help for hydroponic tomato's)
Nutrient Functions and Deficiency Symptoms
Informative Articles - Common Problems
Symptoms of Deficiencies and Toxicities - Greentrees Hydroponics
Nutrient Concentration and Function in Plants

[superman]

okay i am going to do a reservoir change today and i will added some additional calcium and see how it goes

[widespreadpanic]

I'm wondering if my GH FloraMato has sufficient calcium in it.

http://www.generalhydroponics.com/ge..._dry_1.5lb.pdf

If not, what should I use? Calmag or Organicare Calplex Natural Calcium Supplement

[GpsFrontier]

A while back I e-mailed GH the question "Do tomato's need extra calcium" this was there reply;

"Calcium effects the plant's ability to uptake all sorts of nutrients. This is why it is recommended to supplement with Calcium when growing plants that consume a lot of it (such as tomatoes). You most likely won't be able to pinpoint a Calcium deficiency on the plant, because it can appear as a plethora of other deficiencies. Nutrition in Hydroponics is a building block philosophy. Once you have low concentrations of one element, the rest react differently to other elements, and this can start a chain of lockout. Very few growers will know that this all started with Calcium. In your particular case, I would recommend using a CaMg product from the beginning of their lives to the end. That way you won't have to play the guessing game of nutrition manipulation and you will be providing them with the CaMg that they require."

This is the CaMg that GH recommends, I forget exactly how much they recommend using but I would e-mail them at: tech@genhydro.com to find out. I never did get any (I had no money) but someone gave me some calcium nitrate, and I've been using that. Though I still don't know exactly how much of it to use, I'm currently adding it at about 5mL (1 tsp) per gallon. Any calcium supplement that you use should made for hydroponics, or it wont be usable to hydroponic plants.

[widespreadpanic]

The tech over at GH said that if I'm using Floramato I shouldn't have to worry about adding more calcium.

He told me that running the system with that nutrient at an e.c. of 2.5-2.75 there should be plenty of calcium available.

He said if I had blossom end rot problems, then I should use BOTANICARE's CalMag product b/c GH similar product is organic and needs to be broken down---not so good for hydro.