The use of diagnostic tests for determining the nitrogen fertilizer requirements of winter grown cabbages
1989
Bonoan, R.R. | Gregg, P.E.H. | Hedley, M.J. (Fertilizer and Lime Research Centre, Palmerston North (New Zealand))
The use of plant sap and soil nitrogen indices was studied in a range of glasshouse and field experiments. Sampling procedures for collecting and measuring NH4-N and NO3-N in both stem (xylem) and petiole sap were examined. In particular the effects of plant age, sampling leaf position, time of day and sample storage time were determined
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