Calcium nitrate for hydroponic use question.

edweather(Zone 5a/b Central NY)March 20, 2013

I grow in containers using a very fast draning mix. Alot of growers like me call watering 'fertigation' because it borders on hydroponics because we are watering every day, and some use fertilizer with every watering like me. This year I'd like to use a little calcium nitrate in my water to supply an immediate calcium source to prevent blossom end rot in tomatoes. the instructions on the bag of cal. nit. say to use something like 1/2 teaspoon per gallon for hydroponics. Is that what a hydroponic grower would always have in the water? Or just once per week, etc. I'm trying to figure out how much to use and how often to use it. Thanks. Ed.

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cole_robbie(6)

BER relates more to consistent moisture levels than it does to calcium. The problem does manifest itself as a calcium deficiency, but the ultimate cause is moisture inconsistency. The cal nitrate is mostly just a way to apply nitrogen. The calcium in it can help in some ways, but it won't cure your BER by itself. Experiment with your watering frequency, or maybe try setting your containers in a shallow saucer of water so they never dry out completely. If you are drilling drainage holes in a container like a bucket, make them about 2-3 inches from the bottom on the sides. That will give the plant a moisture reservoir so that it never completely dries out.

    Bookmark   March 21, 2013 at 1:28AM
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hex2006

I cant see 1/2 tsp of calcinit weighing much but 1g in 1 us gallon
will give you 50ppm of Ca, 38ppm of NO3 and 2.9ppm of NH4 on top of your source water.

If you`re using basic calcium nitrate (tetrahydrate), 1g per i us gal will give you 31ppm of NO3 and 44.5ppm of Ca.

This post was edited by hex2006 on Fri, Mar 22, 13 at 23:04

    Bookmark   March 22, 2013 at 10:20PM
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