Interpretation of maize leaf analyses in New Zealand

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Abstract
Optimum ranges for nutrient concentrations in maize leaves and DRIS norms have been derived for high yielding maize crops grown in New Zealand. The new diagnostic standards and published standards derived in North America have been compared by diagnosing leaf analyses from a factorial fertiliser trial and from a maize growers' competition. The newly-derived standards suggest that maize grown in New Zealand requires smaller concentrations of nitrogen, phosphorus, magnesium, and sulphur for high grain yields than does maize grown in North America.

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