Fertlizing Hippeastrum And Other Amaryllids

J.E. Shields jshields@indy.net
Sat, 11 Jun 2011 09:24:33 PDT

Let's say "excessive nitrogen" rather than high nitrogen.  Plants normally 
take up only the amounts of nutrients that they need.  The excess phosphate 
in high phosphate fertilizers is going to be ignored by the plant.  Feeding 
a plant on a high phosphate fertilizer may simply amount to starving the 
plant for nitrogen and/or potassium.  Excess potassium in high potassium 
fertilizers may interfere with uptake of calcium (?) but is not itself 
going to flood the plant with potassium.

Nitrogen may be the exception.  It can stimulate growth.  If not balanced 
by potassium, that growth can go mainly to foliage production.  Building 
the bulb up or forming a new inflorescence would require plenty of 
potassium.  Without the K+ to balance the nitrogen, you may not get 
balanced growth in the whole plant.  Why don't you run this past some 
professional plant physiologists at Berkeley and report back what they tell 
you?  I'm just a simple biochemist, and I only took one course in plant 
biochemistry -- albeit at Berkeley, but that was still over 50 years ago.

Jim Shields

At 08:35 AM 6/11/2011 -0700, you wrote:
>I read somewhere that high nitrogen fertilizer causes the bulbs to produce
>lots of leaves in expense of the bulbs. Is this true? Have you experienced
>this with other slower growing amaryllids like South African winter growing

Jim Shields             USDA Zone 5
P.O. Box 92              WWW:    http://www.shieldsgardens.com/
Westfield, Indiana 46074, USA
Tel. ++1-317-867-3344

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