Assessing crop performance in maize field trials using a vegetation index

Autor(en): Federolf, Carl-Philipp
Westerschulte, Matthias
Olfs, Hans-Werner
Broll, Gabriele 
Trautz, Dieter
Stichwörter: active crop sensor; Agriculture; Agriculture, Multidisciplinary; BIOMASS; CANOPY REFLECTANCE; CORN; crop development; ENVIRONMENT; FERTILIZER; field trials; LEAF; NITROGEN DYNAMICS; nitrogen uptake; PHOSPHORUS DEFICIENCY; red edge inflection point; SLURRY INJECTION; SOIL
Erscheinungsdatum: 2018
Volumen: 3
Ausgabe: 1
Startseite: 250
Seitenende: 263
New agronomic systems need scientific proof before being adapted by farmers. To increase the informative value of field trials, expensive samplings throughout the cropping season are required. In a series of trials where different application techniques and rates of liquid manure in maize were tested, a handheld sensor metering the red edge inflection point (REIP) was compared to conventional biomass sampling at different growth stages and in different environments. In a repeatedly measured trial during the 2014, 2015, and 2016 growing seasons, the coefficients of determination between REIP and biomass / nitrogen uptake (N-upt) ascended from 4 leaves stage to 8 leaves stage, followed by a decent towards tasseling. In a series of trials in 2014, and 2015, the mean coefficients of determination at 8 leaves stage were 0.65, and 0.67 for biomass and N-upt, respectively. The predictability of biomass or N-upt by REIP however, is limited to similar conditions (e. g. variety). In this study, REIP values of e. g. similar to 721, represent N upt values from similar to 8 kg ha(-1) to similar to 38 kg ha(-1). Consequently, the handheld sensor derived REIP used in this series of experiments can show growth differences between treatments, but referential samples are necessary to assess growth parameters.
ISSN: 23919531
DOI: 10.1515/opag-2018-0027

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