Fertilizer...Kelp Extract...Compost Tea...Fish Emulsion....Manure (tea)...etc....A little all the time is better than a lot at once... thus endeth the lesson....
That is a great video. What he has to say is right on.
I grow heirloom tomatoes, when I have time to grow tomatoes. I had 7 varieties one year. I had a huge tomato crop that year. Heirloom tomatoes are fun to grow.