Category: Orchid Doctor

NITROGEN SHOCK: Reducing Nitrogen Sharply in August

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 Read More

NITROGEN: Ammoniacal Source

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Urea nitrogen is not as readily usable as ammoniacal nitrogen and ammonium nitrate was added to a commercial fertilizer before application. OIE-RMH Read More

NITROGEN: Best Amount for Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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... Read More

NITROGEN: Function as Fertilizer

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 require... Read More

NITROGEN: Optimal Amounts

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 100 parts ppm. appear to be optimal for phalaenopsis and cymbidiums, for cattleyas, 50ppm. SA85-168 Read More

NITROGEN: Parts Per Million for Maximum Growth

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 Read More

NITROGEN: Properties

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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... Read More

NITROGEN: The Most Important Element

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 tru... Read More

NOMENCLATURE: Names and Problems

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Specie and species, their definitions and correct usage; type specimens, genus, specific names, hybrids, intergenerics, etc., for elucidation see OD84-78; OD85-54; 123 Read More

NOMENCLATURE: Rules

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For advice on 15 problems relating to naming orchids, refer to FR133+ Read More