Abstract:
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The amount of phosphorus (P) required to produce 70 per cent or 90 per cent of the maximum yield was used to compare P requirements. Large differences in the P requirements of the species were obtained. On P deficient soil in three experiments, oats required from 50 to 70 per cent less P than wheat, but required 40 per cent more P on a soil with a long history of superphosphate applications. Compared with wheat, in the year of P application, barley required 50 per cent less P in one experiment, had sim
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