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
