RE: [compost_tea] Re: Kelp

From: Tom Jaszewski <tom_at_livesoil.com>
Date: Sat, 23 Oct 2004 14:38:19 -0700

http://www.surialink.com/HANDBOOK/Production/browns_country.htm

 

http://scholar.lib.vt.edu/theses/available/etd-8597-161835/unrestricted/dis=
s
ert.pdf

 

 Sources:

http://www.surialink.com/communities/AgriAqua_AA/aa_link.asp

 

It seems from most of the research I found today that the key is "brown"
seaweeds as they contain similar components.

 

http://www.fao.org/documents/show_cdr.asp?url_file=/DOCREP/006/Y4765E/y47=
65e
0c.htm

 

 

Seaweed extracts

Seaweed extracts (SE) and seaweed have been used as fertilizers and soil
conditioners for

centuries (Aitken and Senn, 1965; Crouch, 1990). Seaweed extracts contain
not only most of the

major and minor nutrients, amino acids, and vitamins B1, B2, C, E, but also
cytokinins, auxin, GAs,

and ABA-like growth substances (Abetz, 1980; Finnie and Van Staden, 1985;
Munda and

Gubensek, 1975; Moor and Van Staden, 1986; Stephenson, 1968).

Initially, enhanced plant growth with seaweed application was attributed to
its soil

conditioning properties. Later, it was showed that increased trace element
supply could explain only

some of the beneficial effects of seaweed (Francki, 1960 ). Low rates of
seaweed extract could

also promote plant growth significantly (Crouch, 1992, 1993). Thereafter, i=
t
was suggested that

organic compounds, rather than mineral elements, were responsible for
improved growth (Brain et

al., 1973; Blunden, 1977; Crouch, 1993; Finnie et al., 1985). In recent
years, it has been

demonstrated that seaweed products contain phytohormones, and the
stimulating effects of seaweed

extracts may be attributed to these components, especially cytokinins.

Seaweed extracts exhibit various benificial effects on plant growth and
development (Crouch,

1990; Crouch et al., 1990). They may enhance nutrient uptake, regulate plan=
t
growth substances,

increase chlorophyll content, protein synthesis and cell division, promote
root and shoot growth and

improve seed gemination (Beckett et al., 1990; Button and Noyes, 1964; Van
Staden et al., 1994;

Yan, 1993).

Seaweed extracts have been used as a cytokinin-like growth regulator and
exhibit multiple

functions in turf management (Schmidt, 1990). When applied to plants, SE
stimulates shoot growth

and branching (Temple and Bomke, 1989), increase root growth and lateral
root development

(Metting et al., 1990), improve nutrient uptake (Yan , 1993), enhance
resistance to diseases ( Featan

by-Smith et al., 1983) and environmental stresses such as drought and
salinity (Nabati, 1991; Nabati

et al., 1994). It has been observed that cytokinin or cytokinin-like growth
regulators can inhibit the

activity of free radical groups, hydrogen peroxide, and superoxide, which
are the major elements for

chlorophyll degradation during senescence (Sexton and Woulhouse, 1984).
Under drought stress,

they may replace endogenous cytokinin whose production is reduced by stress
conditions (Fletcher

et al, 1988). It has been indicated that a range of naturally occurring and
synthetic cytokinins can

enhance stomatal aperture, transpiration, and the protein
(polysomes/ribosomes) associated with

 

 

-----Original Message-----
From: Jeff Lowenfels [mailto:jeff_at_gardener.com]
Sent: Saturday, October 23, 2004 1:15 PM
To: compost_tea_at_yahoogroups.com
Subject: Re: [compost_tea] Re: Kelp

 

Just your friendly moderator here. This is a good topic for those who
want to go for more fungally dominated teas.

Ascophyllum nodosum is the kelp most use for tea. For some reason it
provides a terrific surface for fungal attachment and subsequent
growth. Perhaps Doc E can either correct or help us with why this
particular Kelp is the kelp of choice with most ACT brewers seeking
fungal teas.

Kelp meal, incidently, seems to work as well judging from some of the
posts this summer. It sure is a lot cheaper. Anyone care to comment on
kelp meal vs kelp powder and Ascophyllum nodosum vs other kelps?

Cheers,

Jeff L
www.alaskahumus.com
Plant a Row in your garden to feed the hungry. Join Plant A Row for the
Hungry. Ask me how. www.gwaa.org/Par/index.html






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Received on Sat Oct 23 2004 - 19:48:36 EDT

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