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In field experiments conducted from 1986 to 1989, nitrogen (N) deficiency in barley crops was corrected with the same efficiency by applying N fertilizer at sowing or by broadcasting it at early tillering. Four plant tests for diagnosing and predicting N deficiency in barley were evaluated. Of these the basal stem nitrate-N test was best with a calibrated critical range of 12 000 to 15 000 mg kg -I when sampling was during early tillering.

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