Assessment of the nitrogen status of onions (Allium cepa L.) cv. Cream Gold by plant analysis
1990
Maier, N.A. | Dahlenburg, A.P. (South Australian Dept. of Agriculture, Adelaide. Northfield Research Lab.) | Twigden, T.K. (Horticare, Murray Bridge (Australia))
In field experiments, based on sensitivity (as indicated by the range in tissue concentrations in response to variations in N supply) and on the correlations between nitrate-N and total-N concentrations and percent relative marketable yield, it was found that nitrate-N and total-N concentrations in youngest fully expanded blades (YFEB) were suitable indicators of the N status of onion plants. Based on the variation in critical values between sites (reproducibility), total-N is preferred to nitrate-N. Correlations between nitrate-N and total-N concentrations in YFEB and bulb quality attributes (scale thickness, glucose concentration, fructose concentration, soluble solids and dry matter) were poor and of little predictive value.
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