The Orchid Doctor Articles under the Heading Nitrogen

Nitrogen Comments
NITROGEN: Ammoniacal Source Urea nitrogen is not as readily usable as ammoniacal nitrogen and ammonium nitrate was added to a commercial fertilizer before application. OIE-RMH 0
NITROGEN: Best Amount for Cattleyas For cattleyas grown in glass marbles 50 ppm. is good; optimal is 100 ppm. equivalent to 4.5 oz. of ammonium nitrate in 100 gals, water, quite low; one oz. in 7,830 gals, is 1 ppm. C72-223; OA79-129; OR74-135 0
NITROGEN DEFICIENCY: In Bark The function of organisms; leaf coloring significance; growth; correction; for analysis, refer to A67-472+ 0
NITROGEN: Function as Fertilizer Large amounts are required for continued production of new cells. AU75-45Used by the plant to make healthy green leaves and stems; it promotes strong green foliage. A70-139Used in excess of requirements it causes plants to grow soft and dark green; will not produce good flowers; bifoliate cattleyas such as C.Portia and C.Porcia do not require as much nitrogen as the regular unifoliates. A71-400Used in increasing amounts, it is found that dramatic reduction in growth in cattleyas follows an increase in nitrogen levels; possibility of a limiting factor exists. OA79-131+; absolutely wrong. OWD 0
NITROGEN: Optimal Amounts 100 parts ppm. appear to be optimal for phalaenopsis and cymbidiums, for cattleyas, 50ppm. SA85-168 0
NITROGEN: Parts Per Million for Maximum Growth Experiments indicated that 113 or 114 ppm., or approximately 100 ppm., equivalent to 4.5 oz. of ammonium nitrate in 100 gals. water was best. OR74-135 0
NITROGEN: Properties Regardless of application to non-orchids, final form taken up is mostly nitrate, readily absorbed by roots; readily leached from soil; forms no insoluble complexes. OD67-219; this does not hold for most orchids -- NH4 is used as readily as N03. OWD 0
NITROGEN SHOCK: Reducing Nitrogen Sharply in August In the Midwest, where cool August nights seldom occur, buds can be initiated for winter flowering by the reduction of nitrogen; applied to cymbidiums. A67-12 0
NITROGEN: The Most Important Element It needs traces of molybdenum for its assimilation by plants; it has an effective range from pH 5 to 9; below or above that, the plant is unable to use it sufficiently. OA78-50; no, this is not true. OWD 0

New Topics

  1. Angela Baxter started topic Catt. walkeriana in category Cattleya Alliance
  2. Luis Imatani asked question RLC/ LC Large flowered hybrids in category General Discussion
  3. Bill Overton asked question Phrag. Panther Run in category General Discussion
  4. William Gorski asked question Orchid Species: Vanda falcata h.v. Ryunotsume in category Species
  5. Stefan Neher asked question Stale Data in category Site Navigation

New Comments

  1. Bill Overton commented on topic "Catt. walkeriana" by Angela Baxter
  2. Gonzalo Rotondaro commented on member plant Cattleya (Sophronitis) cerna by Laura Urban
  3. Steven Kirincich commented on member plant Lc. Little Oliver by Steven Kirincich
  4. Robert Rand commented on member plant Alcra. Winter Wonderland 'White Fairy' by Robert Rand
  5. Thuong Do commented on member plant Schom. tibicinis by Edward Zapata
  6. Bill Overton commented on topic "diseases" by Penny Edwards
  7. William Gorski commented on topic "Orchid Species: Vanda falcata h.v. Ryunotsume" by William Gorski
  8. Stefan Neher commented on topic "Stale Data" by Stefan Neher
  9. Susan Fairbairn commented on topic "diseases" by Penny Edwards
  10. Robert H. Findlay commented on topic "seed vs. pollen parent " by Robert H. Findlay