Shop Orchid Care OrchidTalk Orchid Forum Weather Station Links Nursery

Welcome to OrchidTalk Orchid Forums


The Friendliest Orchid Community on the Internet!


  •  » Learn to Repot your Orchids
  •  » Learn Orchid Care Tips and Secrets
  •  » Find the perfect Orchid for your Growing Environment
  •  » Chat with Orchid Growing Professionals

OrchidTalk - "Bringing People Together to Grow Orchids Better!"


Let us help you grow your Orchids better; Join our community today.


YES! I want to register an account for free right now!


Register or Login now to remove this advertisement.

Page 2 of 2 FirstFirst 12
Results 11 to 16 of 16
Like Tree7Likes

Foliar Feeding of orchids?

This is a discussion on Foliar Feeding of orchids? within the New Growers: Ask the Senior Members forums, part of the New Growers category; Make sure to flush the fertilizer once in a while, or the salt will accumulate ...

Click here to increase the font size Click here to reduce the font size
  1. #11
    gayathri is offline Junior Member
    Join Date
    Apr 2015
    Gender
    Female
    Posts
    5

    Default

    Make sure to flush the fertilizer once in a while, or the salt will accumulate and damage the leaves and roots

  2. #12
    nightwings is offline Junior Member
    Real Name
    Matt
    My Grow Area
    Porch/Patio.
    Join Date
    Sep 2015
    Gender
    Male
    Location
    Bahia Kino, Sonora, MX
    Posts
    24

    Default

    That is interesting, since I do spray with a dilute fertilizer solution. Also, I have recently read in a couple of articles that orchids do not absorb urea well. Now I wonder which is best.

  3. #13
    gayathri is offline Junior Member
    Join Date
    Apr 2015
    Gender
    Female
    Posts
    5

    Default

    Nitrate and Nitrate form of nitrogens are good. Most of the foliar fertilizers are these forms..

  4. #14
    raybark's Avatar
    raybark is offline Senior Member
    Real Name
    Ray Barkalow
    My Grow Area
    Under Lights
    Join Date
    Oct 2012
    Location
    Oak Island NC
    Posts
    1,274

    Default

    Actually, I believe the opposite is true.

    Orchids are not particularly good at foliar absorption in the first place, but there is still some... If you look at relative rates of absorption, roots favor absorption of nitrate and ammonium ions over urea, but foliar tissue s better with urea than it is at absorbing nitrates and ammonium ions.

    If you look at products intended to "green up" crops, you'll find they are primarily urea, usually with fair levels of magnesium and sulfur.

  5. #15
    Dorsetman's Avatar
    Dorsetman is offline Senior Member
    Real Name
    Geoff Hands
    My Grow Area
    Greenhouse
    Favorite Orchid(s)
    Cattleya ?
    Join Date
    Oct 2010
    Location
    England, South coast.
    Posts
    3,246
    Member's Country Flag

    Default

    This is a very complex subject, and not all orchids behave the same way. The ratio of stomata on the two sides of the leaf varies from genus to genus, and probably the capability of taking in liquids does too. Certainly, in the wild, some orchids at least get exactly the same nutrient solution washed over their leaves as they do washed over their roots . Some years ago I got tired of being fobbed off with unlikely explanations as to how epiphytes get their nutrition in the wild, and went to find out. I sat in an Asian rain forest, in rainstorms, in the growing season, and collected what was dripping off the roots of ( as it happens ) a Dendrobium. Of course exactly the same rain, and whatever was in it, wherever it came from, was dripping off the leaves too. I also collected the rain in a glade, where it was not dripping off the trees before it reached anything except the ground. I repeated this on other orchids, in other forests on the same trip.The results were all, broadly, the same. Rain dripping off forest trees, and then running all over epiphytic orchids had an EC of between 500 and 600 uS ( microSiemnens ). Rain falling into my collecting jars - often at the rate of a couple of inches in a 2 or 3 hour storm had an EC of about 50 or so. My conclusion - unchallenged by those who have since repeated my experiments , is that in these instances, the orchids are getting plant sap from the forest trees (etc) on which the orchids grow, exuded from the leaves by osmotic pressure, as everything rushes to grow in the rainy season. In fact, the orchids are taking a short cut ; they are not taking in nitrates, carbonic acid or whatever from the soil and then turning it into their sap ( nutrient fluid mix) - they are taking in prepared sap from their host plants. A surprising conclusion , which I don't think you will read in any book ( although my ideas and observational results have been published in several European Orchid Journals) . They suggest to me that the orchid feeds we can buy are not as good as the stuff the orchids get in the wild in this respect , but I have not yet worked out how to provide my orchids with anything similar.
    Incidentally I have taken readings in English forests in the rain, but we don't have any epiphytic orchids growing wild here.

    As to orchids don't grow as fast as corn etc ; I beg to differ. Firstly I have grown Vandas - large-flowered hybrids - hydroponically, using flood and drain techniques, and measured leaf growth ; the best results, averaged over a summer and winter period ( not using growing lights) were 9 inches of leaf per month.That is equal to say 4 pair of leaves per year, and some of those plants flowered twice a year - even in England (!) and some 55% of the plants - about 70 or 80 plants in the experiment - were doubled spiked.
    Secondly, I have measured Dendrobium kingianum in my greenhouse, and watched plants grow a complete new cane, 15 inches high, in some 3 weeks . At the best, adding over an inch in a day .
    And thirdly, I once visited a large professional growing unit in the Westland of Holland, which had, I was told, some three million plants, grown by a staff of 17 people ; all computer controlled, untouched by hand, etc. They were taking cymbidium seedlings, single growth, the size of a large pencil, and turning them into plants with three spikes of flowers - in 15 months from start to finish. This is growing of the very highest quality which no amateur could hope to match - the attention to detail etc. was amazing. The floor was covered with white plastic, and flushed with disinfectant weekly - so as to leave no possibility of pathogens. When I was there, in late May one year, it was a lovely warm sunny day when I went into the greenhouse, and whilst I was there, a cloud came over the sun ; grow lights came on automatically throughout the greenhouse . I asked why - surely that cloud would only "darken" the sky slightly for a short time ; I was told that they can't afford to lose a growing minute, and anyway - according to their own experimental evidence, when a plant stops growing through the light falling, even when the light is restored, it takes several hours for growing to get back to the same speed as before, and so on....So yes, when conditions are perfect, orchids can grow almost fast enough to watch !

  6. #16
    raybark's Avatar
    raybark is offline Senior Member
    Real Name
    Ray Barkalow
    My Grow Area
    Under Lights
    Join Date
    Oct 2012
    Location
    Oak Island NC
    Posts
    1,274

    Default

    Right off the top, I don't, Naoki. Sorry.

    I recall reading something several years ago that spoke of urea in conjunction with micronutrients being readily absorbable through leaves, but it has been a while.

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Foliar feeding
    By fxxy in forum Semi Hydro / Lights / Greenhouses / Accessories
    Replies: 21
    Last Post: September 30th, 2011, 02:10 PM
  2. Feeding Question
    By work2ski in forum General Orchid Culture
    Replies: 6
    Last Post: September 22nd, 2011, 01:55 AM
  3. Masdevallias feeding
    By Intruder in forum General Orchid Culture
    Replies: 6
    Last Post: January 20th, 2011, 01:24 PM
  4. Foliar feeding
    By hank3443 in forum General Orchid Culture
    Replies: 18
    Last Post: January 20th, 2011, 01:14 PM
  5. Feeding Frenzy!
    By Shannara in forum A Kodak Moment: not necessarily plants...
    Replies: 5
    Last Post: June 13th, 2008, 10:55 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
OrchidTalk --An Orchid Growers Discussion Forum brought to you by River Valley Orchidworks. A World Community where orchid beginners and experts talk about orchids and share tips on their care, cultivation, and propagation.