NPK ratios?

Diana Chapman
Wed, 30 Jan 2008 13:12:00 PST
It is also my understanding that nitrate nitrogen, in the form of potassium 
nitrate or calcium nitrate, is better absorbed at lower temperatures, so 
this is important for those bulbs that grow during the winter.  The 
formulation I use has both ammonium nitrite and potassium nitrate, but the 
main ingredient is potassium nitrate.

Telos Rare Bulbs

> A word about nitrogen. Many years ago Fred Meyer told me that amaryllids
> like Hippeastrum and many others (but not so much hardier fare like Crinum
> or Narcissus) resent N in the form it typically appears in fertilizers: as
> ammonia or urea nitrogen. I made the switch to orchid fertilizers such as
> Dyna-Grow years ago just to get N comprised of mostly nitrate nitrogen, 
> with
> a small percentage of ammonia nitrogen. I bloomed some difficult bulbs 
> when
> I did this, plants that had not flowered for 10+ years previously
> (Hippeastrum parodii, Paramongaia, etc.). Nitrate nitrogen is worth the
> moderate extra cost in my view and it is not difficult to find brands that
> use it.

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