Return to the Hydroponics Forum | Post a Follow-Up

Calcium nitrate for hydroponic use question.

Posted by edweather Zone 5a/b Central NY (My Page) on
Wed, Mar 20, 13 at 22:34

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.

Follow-Up Postings:

RE: Calcium nitrate for hydroponic use question.

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.

RE: Calcium nitrate for hydroponic use question.

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

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Hydroponics Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here