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Old 10-10-2019, 06:08 PM
Shadowmagic Shadowmagic is offline

Join Date: Sep 2019
Posts: 42
phosphorous for flowering
Default phosphorous for flowering

earlier on today camille posted a link to the AOS guide on commercial phalaenopsis growing and although some of the advice comes across really defensive and some really outdated there has been some useful information in there.

here is an extract from article 2 I want to share:

Plants supplied with 200
ppm nitrogen at every watering were
superior to plants fertilized with 100
ppm of nitrogen (or less) at every
watering. Therefore, we recommend
incorporation of a complete fertilizer
delivering 150 to 200 ppm nitrogen at
every watering with adequate leaching.
Another misconception is that a
high concentration of phosphorus
ensures excellent flowering. Research
has repeatedly shown that many
growers have been using excessive
concentrations of this nutrient. In one
study, phosphorus varying from 22 to
242 ppm (with 100 or 200 ppm of
nitrogen) did not influence growth or
flowering of phalaenopsis. Preliminary
research indicates that 25 to 50 ppm
phosphorus is adequate to grow an
excellent crop

Glad I finally found a good source stating one nutrient is fine all year round and messing with different NPK ratios is just overcomplicating things and shown to not even be beneficial for phals

Last edited by Shadowmagic; 10-10-2019 at 06:10 PM..
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Old 10-10-2019, 07:19 PM
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Roberta Roberta is offline
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Location: Coastal southern California, USA
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phosphorous for flowering Female

There was lively discussion about 6 weeks ago on the topic... Some very good information in the thread:

When to fertilize with blooming fert?
"Extraordinary claims require extraordinary evidence" Carl Sagan

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What's blooming for Southern California Species hobbyists
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flowering, nitrogen, phosphorus, ppm, watering

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