Dear Sir,
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Thanks for looking into this situation, Sincerely, M. Pie
tachung_h wrote:
> What are the experience from members of this list in using Humic Acid to
> buffer the negative impact of inorganic fertilizer such as NH4 and to
> allow minerals to be easily absorbed by plants.
>
> Regards
> TaChung Huang (���j��)
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On
> Behalf Of Lloyd Charles
> Sent: Saturday, October 12, 2002 5:44 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Nutrient blockers
>
> ----- Original Message -----
> From: tachung_h <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Saturday, October 12, 2002 3:41 AM
> Subject: RE: Nutrient blockers
>
> > Hi Lyoyd: Thank you for the kind assistance and explanations. It is
> > very helpful.
> >
> > What does it mean when people say that long term usage of inorganic
> > fertilizer will cause the soil to become acidic? Is it because the
> > fertilizer itself is acidic?
> There are some fertilisers that are acidic but the main cause of soil
> acidity seems to be from chemical reactions involved in the nitrogen
> cycle and breakdown of organic matter There are several mechanisms
> involved 1. The actual chemistry of the fertiliser applied - when
> ammonium NH4 is converted to Nitrate NO3 there is excess hydrogen into
> the soil solution - these fertilisers need about 2kg of lime per kg of
> Nitrogen to neutralise the released hydrogen. 2. Leaching of Nitrate
> leaves excess hydrogen 3. Excess application of nitrogen fertiliser
> burns up soil organic matter leading to further excess of nitrate and
> leaching (this can happen with excessive animal manures too) Good
> healthy microbial activity will prevent much of this from happening by
> buffering the negative effects, by locking up applied nitrogen and
> releasing it slowly as plants require it.
>
> > Or is it because the calcium is bonded with
> > other ions and leached away?
> Soils low in calcium (unbalanced) require higher inputs (overdosing)of
> salt fertilisers to get a satisfactory yield - the plants are watery,
> brix readings low, and the plants more susceptible to drought stress,
> diseases and insect attack. There is much more to this than I have
> written here L Charles
>
> >
> > Regards
> > TaChung Huang
> >
