Phosphorus
(P)
Efficacy
Another
commonly held misconception is that RPR fertilisers are
not as agronomically
effective as water-soluble forms of P, despite international research
and practice in countries such as USA and New Zealand
being to the
contrary.
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Carrs
Fertilisers commissioned an independent, five year (1996-2000) research
trial through Scottish Agricultural Colleges (SAC) in which the agronomic
effectiveness of Gafsa RPR was compared to water soluble P (TSP)
on a permanent grass site in Midlothian. The key results are summarised
below.
The
results of the five-year trial with SAC clearly demonstrate that
Gafsa RPR, not only held its own with TSP in terms of productivity,
but outperformed it. These results mirror data from other countries
where RPR's are widely used.
Gafsa
RPR - the base material for the Scotphos range - outperformed water
soluble P (TSP) in terms of increased total DM production and clover
production over the five year period. TSP had shown up comparatively
well in the early stages of the trial but could not match the sustained
supply of available P from Gafsa over the entire five years. This
is further highlighted by the measurement of herbage P content at
the end of the five year period which was considerably higher in
Gafsa.
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Phosphorus (P) Environment >>
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