I don't understand this

Ina Crossley klazina1@gmail.com
Tue, 26 Feb 2013 19:38:34 PST
I was reading an article which was about scientific writings which 
included Zephyranthes.

One comment at the end was:

"From this study it was concluded that preferred conditions for both 
species were fertigation of twice a week using fertilizer rate of 150 
ppm N under full sun"

This is in reference to both Habranthus and Zephyranthes.  What does 150 
ppm N mean?  I know that would be nitrogen, but how would one know that 

Fertilising twice a week seems a lot to me, but I would be happy to try 
it, as long as I knew what I should use.  I thought fertilisers had 
always more than nitrogen in it.


Ina Crossley
Auckland New Zealand zone 10a

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