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> Harold,
> 
> Do you know or does anyone in the group know why the addition of
nitrogen,
> be it feeding the plant via the ground or foliar feeding, brings on bug
> problems.
> 
> I have noticed this the past couple of years and discussed it with other
> local growers who have commented on the same problem.
> 
> It seems as soon as the plant has taken up nitrogen to a given level the
> bugs are on your plant like white on rice!
> 
> Is there anyway are means to get around this problem and why do bugs pick
> up on the nitrogen level in plants so quickly, it is almost as if it is a
> pheromone?
> 
> Chris Andersen
> Moraga, Calif.
> 
> ***********************************************************************
> 
> There are several different sources of N, P, and K used to make
fertrilizer
> formulations.  Generally for dry fertilizer materials, the P comes from
> diammonium phosphate (DAP), and the K comes from potassium chloride
(KCl).
> The N is supplied from the DAP as well.  Since DAP is 18-46-0 and KCl is
> 0-0-60 or 0-0-62, they are blended to make the formulation you want.  The
> additional N may come from Urea (45-0-0) added to the mix, or ammonium
> sulfate or some other N source.    For liquid fertilizers, other sources
of
> N, P or K may be used, depending on the solubility and on the desired
use.
>  Urea-ammonium nitrate solution is often used as the N source and
potassium
> hydroxide (KOH) for the K source.  Phosphoric acid is the raw ingredient
> for the P source.  It comes in different concentrations.
> For foliar applications, the materials used as N, P, K sources need to
have
> a low salt level to avoid injury to the leaves.  This usually means a
> higher cost raw material.  But for small amounts used in gardens, this is
> not a serious cost difference.  The garden and lawn fertilizers generally
> have a lower analysis than fertilizers used for farm fields, so it takes
> more material to get the same amount of nutrients.  This makes it easier
to
> get a uniform rate of application and reduces potential injury to the
> plants.  These low analysis products are less practical for field
> application because of the volume needed to provide adequate nutrients to
> the crops.  Handling and transportation would be very expensive relative
to
> the more concentrated fertilizer materials.
> If you would like more detail on this, feel free to send me an e-mail.
> Harold Reetz
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