NITROGEN: Parts Per Million for Maximum Growth

Culture Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 8 years ago.

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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
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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: 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

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