Issue: 03.2013 (EN) 11
▪ Weather: The N-Tester is not able to display future N
soil supplies, e. g. from applied N that plants have not
yet absorbed due to drought. Therefore, use your
experience when evaluating the fertilizer
recommendation.
▪ Drought: Intensive drought can lead to an increased
chlorophyll concentration in the leaves and to wrong N-
Tester readings. Therefore avoid measuring plants that
suffer from visible drought stress (e.g. leaves rolled
together).
The following factors do not have an effect on the N-Tester
reading:
▪ Time of the day when measuring
▪ Pesticides
▪ Moisture on the leaf
▪ The use of strobilurins
▪ Yield level
Carry out measurements
Each measurement comprises the following steps:
▪ Calibrate internally (after the device has been switched
off)
▪ Measure 30 x
▪ Read off and evaluate the measuring result
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