The Orchid Doctor Articles under the Heading Rockwool

Rockwool Comments
ROCKWOOL: Absorbs Fertilizers During a dark winter the Electric Conductivity can double in the nutrient solution, so make it half normal strength; urea fertilizer applied to it hardly has a chance to be used before it is washed out again, before bacterial action can make it available to the roots. OA87-163; 201 0
ROCKWOOL: As Potting Medium It is inert, a spun rock, like fiberglass, it comes in three grades -- fine, medium, coarse -- and in both absorbent and non-absorbent types, including Grodan horticultural grade, available in 3 or 4-inch growing blocks which are absorbent; the advantages claimed for it include -- sterility, inertness, ease of repotting, its maintenance of a 15% air space, it provi des for fertilizer control; its disadvantages are its high cost originally and the care required to achieve correct fertilizer levels; it has to be kept wet; for odontoglossums it requires a 20-20-20 fertilizer. RMHIt is used for growing cymbidiums. A85-841It is volcanic rock melted down into cot tony fibers, it is inert, sterile and does not decompose; po11 ing-on is possible without di sturbing the root ball; the pH is perfect when watering with commercial 20-30-20 fertilizer; advt. A88-332This is the name given to several commercial insulating materials on which orchids can be grown by adjusting the watering and fertil... 0
ROCKWOOL: With Perlite as Potting Mix A two year commercial experiment growing in a mix of water-repellent rockwool and perlite, with trial balances of nutrients and trace elements was termed a success; advt. A87-Jy-xiv 0

New Topics

  1. Pam Alexander asked question How to repot a Mattie Shave in category General Discussion
  2. Rae Walker asked question Name help in category General Discussion
  3. John Small asked question Schomburgkia, species or hybrid in category General Discussion
  4. Robert H. Findlay asked question Help with ID of this Eria sp. in category General Discussion
  5. Osura Mindula Gunasena asked question Help to Identify the Id of this Vanda in category General Discussion

New Comments

  1. Carol Holdren commented on topic "How to repot a Mattie Shave" by Pam Alexander
  2. Frank Cambas commented on member plant Zns. Cynosure var. Blue birds by Ben MG
  3. Robert H. Findlay commented on topic "Lady Bug or dangerous bug" by John Small
  4. Robert H. Findlay commented on topic "Help with ID of this Eria sp." by Robert H. Findlay
  5. Carol Holdren commented on topic "Name help" by Rae Walker
  6. Carol Holdren commented on member plant Dtps. Younghome Little Spirit by Heather A
  7. Sara D commented on member plant Den. Green Mist by Sara D
  8. Sara D commented on member plant Phal. bellina var. Coerulea by Sara D
  9. Sara D commented on member plant Pot. Marie Yellow Bird var. Love Love by Sara D
  10. Carol Holdren commented on topic "Help to Identify the Id of this Vanda" by Osura Mindula Gunasena