Liquid feeds like Tomorite are really concentrated. You need hardly any to feed your plants. If in doubt, use more dilute, not stronger.

Thank you I am just using what it says on the bottle. Last year all the tomatoes turned black on the bottom and I had to through them away.I don`t know whether it was because I give them too much water or too much Tomorite.

The tomatoes turning black on the bottom sounds like blossom end rot, which I thought was due to letting them dry out too much. Some types may be more prone than others - I had that problem a lot with Roma VF but no problems at all with Gardeners Delight or Tigerella which have all had the same occasionally inconsistent watering!

Sometimes in containers or grow bags, blossom end rot is a calcium deficiency, which can be cured with gypsum or lime.

thankyou for your help