Effectiveness of dicalcium phosphate compared with superphosphate for wheat grown on acidic sandy soils
2005
Brennan, R.F. | Bolland, M.D.A.
The effectiveness of dicalcium phosphate (DCP) was compared with the effectiveness of superphosphate in a greenhouse experiment using two sandy acidic soils from southwestern Australia. Fertilizer effectiveness was determined using yield of dried shoots of 46-day-old spring wheat ( Triticum aestivum L.) plants.The DCP was about one-third as effective as superphosphate for yellow sand and one-fifth as effective for red sand; thus, about three to five times the amount of phosphorus (P) as DCP was required to produce the same yield as P added as superphosphate. Per unit of applied P, the P concentration in dried shoots was larger for soil treated with superphosphate than for soil treated with DCP. Critical P, the P concentration that was related to 90% of the maximum shoot yield, was about 0.70% (dry weight basis) for both sources of P and both soils.
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