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  #1  
Old 03-26-2020, 05:31 PM
banabo banabo is offline
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nitrates in water
Default nitrates in water

My well water is a good PH but I have 20 PPM nitrates in the water. I've read that nitrates are good for orchids, but I'm not sure if 20 PPM is too much. I have a variety--catt's, phalaenopsis, zygo, dendrobiums, onciduims, etc.

Can someone please advise?
thanks
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  #2  
Old 03-27-2020, 08:59 AM
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20 ppm nitrate is a relatively high concentration for drinking water, but is what some would call an “ideal” level for orchid irrigation if you watered very frequently - every day or two. If you water less frequently, you’re still going to want to add fertilizer, but how much will depend on your actual watering frequency.

My general rule of thumb is to apply about 75 - 100 ppm N over the course of a week. If you fed and watered once a week, I’d add about 55 - 80, compensating for that in the water. If you feed once a week, but water once in-between, drop 20 ppm from the addition.
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Old 03-27-2020, 09:40 AM
Orchid Whisperer Orchid Whisperer is offline
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20 ppm nitrate is double the federal maximum contaminant level (MCL) for drinking water. Ok for washing, etc., not drinking, especially for children.

You might want to figure out why your well has such high levels.
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Old 03-27-2020, 09:21 PM
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Quote:
Originally Posted by Orchid Whisperer View Post
20 ppm nitrate is double the federal maximum contaminant level (MCL) for drinking water. Ok for washing, etc., not drinking, especially for children.

You might want to figure out why your well has such high levels.
High nitrate levels in drinking water almost invariably result from fertilizer getting into ground water.
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Old 03-28-2020, 01:33 AM
Orchid Whisperer Orchid Whisperer is offline
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High nitrate levels in drinking water almost invariably result from fertilizer getting into ground water.
That is possible, but it could be from a septic system or similar source. Not fertilizer in a commercial/ agricultural sense, but yes, "nutrients". An old, shallow, or poorly-constructed well could matters worse.

Last edited by Orchid Whisperer; 03-28-2020 at 01:39 AM..
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