Resumen en Inglés :

A
procedure was adopted which
is basically
the
one
proposed
by Olsen et
al.
with
the
following modifications:
no
activated
charcoal is
used and the determination
of
phosphorus
is
made with
the
OSMOND
-
ZINZADZE
method. The phosphorus extracted
,
when
it
is expressed as
pp2
m
Po5
, soil basis
corresponds
to
about
thesame values as the
relative yields
(NK
/
NPK
. 100)
obtained withthe lettuce pot
- culture
test
.

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