WHAT IS THE MOST efficient phosphorus fertilizer? The
question is not as simply answered as it could have been
few years ago. Modern technology has produced many different
fertilizers containing phosphorus, but superphosphate is still the
backbone of the fertilizer industry.
All fertilizer phosphorus comes from phosphate rock-tricalcium
phosphate. The phosphorus in the rock is not readily available
to crop plants because the natural rock contains 1 to 3
percent of fluorine, and this makes the phosphorus soluble with
difficulty. Nevertheless, it has been and still is the practice to
grind the rock very finely and use it for fertilizer, since some
of the phosphorus becomes available with time. In the fertilizer
trade, this finely ground rock is called by various names such
as "rock phosphate," "ground rock phosphate," and "raw rock
Bridgford, Roy O.; Rost, C. O..
Comparative Value of Rock Phosphate and Superphosphate as Fertilizers.
Minnesota Agricultural Experiment Station.
Retrieved from the University of Minnesota Digital Conservancy,
Content distributed via the University of Minnesota's Digital Conservancy may be subject to additional license and use restrictions applied by the depositor.