[permaculture] [Fwd] Soil Fertility

Dieter Brand diebrand at yahoo.com
Sun Jun 24 04:46:59 EDT 2007

In his "Biological Study on Organic Thinking" entitled "Bodenfruchtbarkeit"
  (Soil Fertility) (1968), H. P. Rusch, cofounder of the bio-organic school of 
  organic farming in Germany (different from the bio-dynamic school founded 
  by Steiner), claims that the soil is best fed by frequently supplying small 
  doses of organic matter to the soil surface. Regarding the different soils 
  in hot and cold climates, he states that the reserves of long-term stable 
  humus in the soil increase as you go North because the high temperatures 
  in hot climates cause humus to deplete at a higher rate. This means that in 
  the hot regions of the world more organic matter needs to be returned to
  the soil than in a cold climate just to maintain levels of Soil Organic Matter. 
  This is possible because longer growing seasons in the South translate 
  into the production of more biomass.
  Dieter Brand

"Lawrence F. London, Jr." <lfl at intrex.net> wrote:
  -------- Original Message --------
Subject: Re: [SANET-MG] nutrition in a bottle or a bag?
Date: Sat, 23 Jun 2007 22:39:30 -0700
From: Tanya Kucak 

The most interesting work on soil fertility I've seen is a few short
papers by Roland Bunch based on the work of Ana Primavesi. Basically,
she describes the traditional approach to fertilization as the
Nutrient Quantity Concept -- the notion that specific nutrients need
to be supplied to plants in periodic large doses -- and proposes that
in the tropics, the Nutrient Access Concept is more important. This
is the notion that plants need constant access to tiny quantities of
nutrients, best supplied by nurturing the soil biology and using
sufficient compost and mulch.

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