Calcium nitrate for grapes

poolecw(Georgia 7b)July 10, 2013

I have read on several ag extension and nursery websites that calcium nitrate should be applied to 1st year grape plants once per month through the summer. It also says to apply 10-10-10 once per month through the summer as well (apply each 15 days apart)

Do you recommend the calcium nitrate? What is this supposed to do? I assume the nitrates are the good guy here. Could nitrate of soda be a substitute? I can only find calcium nitrate online.

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fruitnut Z7 4500ft SW TX

Calcium nitrate is used to help treat the bitter pit disorder of apples. That's a lack of calcium in the fruit resulting in sunken spots on apples. Other than that I haven't heard of it being used much. Ammonium sulfate or Urea are probably cheaper. AS is good on alkaline soils because of it's acidifying effect. Urea is cheap and good where lower pH isn't wanted or needed.

Fertilizing once a month with nitrogen is good if you want max growth but not usually good on bearing fruits. 10-10-10 every month is way overkill. If you need the P and K apply once a year. Don't apply them if not needed.

    Bookmark   July 10, 2013 at 3:29PM
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poolecw(Georgia 7b)

Thanks for the info. The link below references the instructions that I am talking about.

Here is a link that might be useful: Link

    Bookmark   July 10, 2013 at 3:39PM
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fruitnut Z7 4500ft SW TX

No question that fertilizer schedule will result in rapid establishment of any kind of grapes or other fruits. So if growing Muscadines by all means go for it. They do cut fertilizer after bearing beings and do recommend a soil test.

Some of the info is on the questionable side. They say most of the feeder roots are in the top 1/2 inch of soil and then recommend shallow cultivation if needed. I guess it better be really shallow. Mulch would be better.

    Bookmark   July 10, 2013 at 3:52PM
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You can buy calcium nitrate at any feed & seed store. It's about $17 for a 50b bag.

    Bookmark   July 10, 2013 at 5:18PM
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