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  • From: "nan and stewart" <stewart AT watervalley.net>
  • To: "market farming" <market-farming AT franklin.oit.unc.edu>
  • Subject: nitrate accumulation
  • Date: Thu, 1 Feb 2001 08:03:17 -0500

In Growing For Market, August 2000, Amigo Cantisano's column discussed problem of too much nitrogen in greenhouse and field crops, depending on day length and soil temperature.....he did tissue nitrate tests, etc....
 
It was a problem (the symptom being aphid outbreaks..aphids evidently love plants high in nitrates and free amino acids, abundant in high nitrate conditions....
 
one of his solutions was to cut back on preplant organic nitrogen fertilizers and compost, eliminate side dressing and supply extra calcium phosphorus and zinc for crps gorwing during the peak biological activity of the year....
 
how this applies to winter greens in greenhouse......he doesn't say in that article, but he can be reached at 530-292-3619 or email: orgamigo AT jps.net  (he charges for consulting)
 
 
it got me thinking and when i noticed a product in Territorial Seeds catalog called Winter Roots organic plus fertilizer (1-8-4) for use during LOW LIGHT winter conditions....i bought some and used it outdoors on my greens (but since i have such terrible soil, nitrogen build up not an issue)  you might ask them more about this.....
 
amigo says you cannot tell visually if plants have too much nitrates, only with nitrate meter and a refractometer........
 
food for thought
 
 


  • nitrate accumulation, nan and stewart, 02/01/2001

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