PH OF WATER: Testing

Culture Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 4 years ago.

Article Blog   Article Index
Litmus paper used to determine pH is unsatisfactory because color variations are too subtle to be determined; use a colormetric method where drops of Brom Creosol Purple are added to water to get a color reading. A73-55; OD65-120
Share on Social Media:  
Log in to Add a Comment

More The Orchid Doctor Articles under the Heading PH of Water

PH of Water Comments
PH METERS: Electronic Type How do they work? -- place a small amount of potting bark or tree fern in water enough to moisten the medium and the electrode or probe and test. A81-688 0
PH OF WATER: Acidifying Small Quantities Use phosphoric acid in a sink full of water, adding it drop by drop until the desired and tested-for acidity is reached and before pots with plants are immersed in it. A57-417; use citric acid. A73-917 0
PH OF WATER: Adjusting Ph When Too High Use dilute sulphuric acid or dilute orthophosphoric acid. A68-719; A78-13 0
PH OF WATER: Adjusting with Vinegar Do not use vinegar to adjust the pH if it is too high; not recommended because acetates can be toxic to plants. A78-13 0
PH OF WATER: Adjustment of Salty Tap Water Phosphoric acid used to adjust slightly alkaline pH of 7.5 to acid pH of 5.5 to 6.0, thereby increasing the solubility of tap water to sodium chloride, to prevent crystallization on roots, etc.; accumulation of salts arrested. A73-53; A75-54 0
PH OF WATER: Appropriate Water can have a pH reading of from 4 to 9; the water of Gainsville FL is close to 8.5 and has been used at the University of Florida without serious problems since Ponce de Leon. A85-471 0
PH OF WATER: Citric Acid Used Local water supply was highly alkaline, pH of 10.5, and was lowered to 5.5 twice weekly using a Hydromix proportioning unit; a drop or two of food coloring was also added. A72-1003 0
PH OF WATER: Cymbidiums The best pH for them is not so much a matter of pH as to make sure the water is low in salt content. A70-725Their requirement is around 7.0. A78-713 0
PH OF WATER: How to Raise It To raise the pH cf your water supply above 5.0 it is receommended to use sodium hydroxide as the basic solution. A88-35 0
PH OF WATER: Its Effect on Orchids A pH of 5 or lower is satisfactory for watering if the sodium and calcium content are not too high; the facts can be found out from your city authorities; a laboratory analysis will determine if your supply is satisfactory. A82-804 0
PH OF WATER: Recommended A satisfactory analysis for Somerville,N.J. is a pH of 7.2; it has a water supply like most of N.J.; some supplies are high in soluble salts; 8.4 in North Brunswick,N.J. is good despite the high pH reading. A71-715 0
PH OF WATER: Satisfactory Range 7 is recommended A78-309; other pH possibilities are: 8.0 to 8.4 is completely satisfactory; 7.2 or 8.4 should not be tampered with, depending on the locality; between 5.0 and 5.6 (medium strong acidity) gives excellent results also; references cited. A73-916 0
PH OF WATER: Softeners De-ionization produces excellent water for orchids; salt, or ion, displacement does not; chemical supply houses sell small laboratory de-ionization or de-mineralizer units. A80-4 0
PH OF WATER: Sulphuric Acid Used to Reduce Ph to 5.6 The long range effects are none if pots are leached with every watering; orchids tolerate good amounts of sulfates. A75-500 0
PH OF WATER: Tree Habitats Rain water has a low pH; activity of fungi, bacteria, lichens, algae etc. on bark, plus leaf leaching produce an acid state through production of organic acids; fungi normally like a pH of 4.5 to 6.5, and possibly produce organic nutrients as amino acids and vitamins. F68-112 0
PH OF WATER: Well-water If it has a pH of 5 and contains 105ppm. of calcium it is a suitable pH and is not excessive in calcium. A78-812; A80-739 0

New Topics

  1. Robert H. Findlay asked question sideways images in category Site Navigation
  2. Khanh tran asked question Arranges Elro in category General Discussion
  3. John Small asked question Which is correct? in category General Discussion
  4. Jean Seymour asked question Can someone give me the name of this orchid? in category Phalaenopsis
  5. Debbie Chase asked question Help to Identify Orchid in category General Discussion

New Comments

  1. Mo Chen commented on member plant Holc. kimballianum by Mo Chen
  2. Carol Holdren commented on topic "Which is correct?" by John Small
  3. Carol Holdren commented on topic "Arranges Elro" by Khanh tran
  4. Fran Fassman commented on orchid E. Thomas Fennell
  5. Lauren Hutchison commented on topic "Unmatched Oncidium Alliance Orchid" by Colin Campbell
  6. Lauren Hutchison commented on member plant Oip. Celtic Sun 'Maya' by Dex W
  7. Lauren Hutchison commented on member plant Phalaenopsis Tristar by Lauren Hutchison
  8. Lauren Hutchison commented on member plant Phal. OX Golden Apple 'Honeycrisp' by William Gorski
  9. Debbie Chase commented on topic "Help to Identify Orchid " by Debbie Chase
  10. Tien Pham commented on member plant V. Yip Sum Wah 'Flame' by Tanya Lam
  11. Carol Holdren commented on topic "Can someone give me the name of this orchid?" by Jean Seymour
  12. Carol Holdren commented on member plant Spathoglotis plicata (Ground Orchid) by Frances LaVigne
  13. Frances LaVigne commented on member plant Grt. Rosy Jewel var. alba by Frances LaVigne
  14. Barry Mellefont commented on article "ANTS: Nesting Between Osmunda and Bark Slab Requires Control Safe for Visiting Hummingbirds" by Robert M. [Bert] Hamilton (Compiler)
  15. Carol Holdren commented on member plant Bc. Jairak Kiku 'Jairak kiku' by Frances LaVigne
  16. Frances LaVigne commented on member plant C. purpurata var. (flammea x sanguinea) by Carol Holdren
  17. Frances LaVigne commented on member plant Ascda. Kulwadee Fragrance by Frances LaVigne
  18. Melvin Waki commented on member plant Hwra. Lava Burst by Jeanne M Uzar
  19. Carol Holdren commented on member plant Den. Ruth Chun's Gemini by Melvin Waki
  20. Samuel Yanos commented on member plant Coel. rochussenii 'Waki' by Melvin Waki