Masterblend 4-18-38 question for tomatoes in potting mix

LoriA · May 1, 2021

I've read quite a lot (and watched videos) of this fertilizer for hydroponics. What I haven't seen answered, though, is exactly how to use it for tomatoes in pots (2'x4' boxes, and half-barrels...big pots). I understand the mixing process of the three components - don't pre-mix, use exact measurements, add the calcium nitrate last, etc. But how is it used for containers? Do I use it weekly, daily, exclusively, a little per plant daily and then finish watering with non-fertilizer water?

I have seven 2'x4' boxes on my deck that will have two tomatoes each, and about 10 other large (half-barrels) containers for tomatoes. Plus some more containers for peppers, zucchini, etc. MG potting mix with some small pine bark mulch mixed in. Have been fairly successful for several years, but this is the first time I'll be using the 4-18-38 fertilizer/calcium nitrate/epsom salt.

Thank you.

May 1, 2021	#1
LoriA Tomatovillian™ Join Date: Apr 2013 Location: MI Posts: 11	Masterblend 4-18-38 question for tomatoes in potting mix I've read quite a lot (and watched videos) of this fertilizer for hydroponics. What I haven't seen answered, though, is exactly how to use it for tomatoes in pots (2'x4' boxes, and half-barrels...big pots). I understand the mixing process of the three components - don't pre-mix, use exact measurements, add the calcium nitrate last, etc. But how is it used for containers? Do I use it weekly, daily, exclusively, a little per plant daily and then finish watering with non-fertilizer water? I have seven 2'x4' boxes on my deck that will have two tomatoes each, and about 10 other large (half-barrels) containers for tomatoes. Plus some more containers for peppers, zucchini, etc. MG potting mix with some small pine bark mulch mixed in. Have been fairly successful for several years, but this is the first time I'll be using the 4-18-38 fertilizer/calcium nitrate/epsom salt. Thank you.