Articles
SUPPLEMENTARY NITROGEN APPLICATION IN LEEKS, BASED ON DETERMINATION OF CROP NITROGEN STATUS
Article number
571_18
Pages
155 – 161
Language
English
Abstract
From a number of basic relationships between several crop ecological components (Booij et al., 1996a) a system was developed for giving supplementary nitrogen application in leeks, that was based on the measurement of light interception.
A description of the approach is given and a comparison is made with existing systems for supplementary nitrogen application.
A comparison was made for four aspects: nitrogen input, yield, quality and residual mineral soil nitrogen.
The system based on the measurement of light interception performed in general as well as a system that was based on the determination of soil mineral nitrogen.
However, the system based on the measurement of light interception is easier to use and provides a recommendation instantaneously.
For both systems yield and quality were the same as for the standard recommendation but nitrogen input was less and residual mineral soil nitrogen was reduced.
A description of the approach is given and a comparison is made with existing systems for supplementary nitrogen application.
A comparison was made for four aspects: nitrogen input, yield, quality and residual mineral soil nitrogen.
The system based on the measurement of light interception performed in general as well as a system that was based on the determination of soil mineral nitrogen.
However, the system based on the measurement of light interception is easier to use and provides a recommendation instantaneously.
For both systems yield and quality were the same as for the standard recommendation but nitrogen input was less and residual mineral soil nitrogen was reduced.
Authors
R. Booij, B. Meurs
Keywords
Leeks, nitrogen, fertilization, light interception, nitrogen uptake
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