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Abstract:
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Contents : Summary -- Respone of carrots (Daucus carota L.) to applied phosphorus and phosphorus leaching on a Karrakatta sand, under two irrigation regimes /I.R. McPharlin, P.M. Aylmore, R.C. Jeffery -- Response of cauliflowers to phosphate fertiliser placement and soil test phosporus calibration on a Karrakatta sand / I.R. McPharlin, W.J. Robertson, R.C. Jeffrey and R. Weissberg -- Determination of the residual value of phosphate and soil test P calibration for carrots on a Karrakatta sand / I.R. McPhar
reg Dellar and Maurice Eales.
(En)
Vegetable production on the sandy soils of the Swan Coastal Plain was valued at $56M in 1992/93. The future of the industry is in jeopardy if its environmental impact is not minimised. The two major environmental concerns are the leaching of phosphate and nitrogen fertiliser into water bodies. Phosphorus in excess of 0.1 mg/litre can result in algal blooms in surface water bodies and nitrogen in excess of 10 mg nitrate-nitrogen/litre is harmful for drinking purposes. The sands of the Swan Coastal Plai
l and maximise yield. Adoption of P soil testing on the yellow Karrakatta sands could save growers $300 to $400/ha on average and reduce the impact on water bodies. Banding did not increase the efficiency of phosphorus fertiliser use compared with bro
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