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Abstract:
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In a field experiment on a sandplain soil in a low rainfall Mediterranean environment of south-western Australia, the effectiveness of superphosphate applied in 1986 was measured in three subsequent years relative to freshly-applied superphosphate each year, using grain (seed) yields of wheat (Triticum aestivum) and lupins (Lupinus angustifolius). For each level of superphosphate applied in 1986, soil test values decreased with increasing time from application. The relationship between grain yield and s
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