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Phosphorus
(P)
(please
also see Scotphos)
Up
to 50% of P inputs to farming systems are lost to ground
and surface
waters which is inefficient, costly and environmentally damaging.
Research from New Zealand and Ireland has shown that
losses from
water-soluble forms of P are up to 25 times higher than from phased
release forms of P such as Gafsa.
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Carrs
Fertilisers have conducted a five-year trial (1996 - 2000) with
SAC, which has demonstrated that phased release forms of P such
as Gafsa are as agronomically effective as water-soluble forms of
P, and more so in many cases.
These
two research projects combine to show the agronomic and environmental
benefits of farmers applying phased release P fertilisers (i.e.
containing a proportion of both fast acting water-soluble P and
longer lasting P).
Phased
release P fertilisers are ideally suited to provide the crop with
its immediate P requirements from the water-soluble proportion and,
at the same time, maintain the soil P reserves from the longer lasting
source. Phased release P will also minimise P losses to the environment
and, by providing available P throughout the season, will increase
the uptake and utilisation of N.
NEXT:
Calcium >>
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