Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 424927
Title Satellite-based herbicide rate recommendation for potato haulm killing
Author(s) Evert, F.K. van; Voet, P. van der; Valkengoed, E. van; Kooistra, L.; Kempenaar, C.
Source European Journal of Agronomy 43 (2012). - ISSN 1161-0301 - p. 49 - 57.
Department(s) PPO/PRI AGRO Duurzame Bedrijfssystemen
Laboratory of Geo-information Science and Remote Sensing
PPO/PRI AGRO Toegepaste Plantenecologie
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) nitrogen application - moisture - wheat - crop
Abstract When using variable-rate application (VRA), tractor-mounted sensors are typically used to measure crop status. Crop status can also be measured with a satellite-based sensor. In both cases a vegetation index derived from the sensor measurements is used as an indicator of the amount of crop biomass. The first objective of this study was to establish a relationship between the Weighted Difference Vegetation Index (WDVI) in potato as measured with a nearby, ground-based crop reflectance meter on the one hand and WDVI as measured with remote, satellite-based sensors on the other hand. It was found that groundbased WDVI and satellite-based WDVI are strongly and linearly related, thus making it feasible to calculate herbicide rates for potato haulm killing on the basis of satellite-based measurements. The scale at which VRA is applied is an important determinant of the reduction in input use. The second objective was to estimate the potential to reduce herbicide use for potato haulm killing as a function of the size of decision units, using the above-mentioned relationship, satellite imagery of 13 potato fields and a previously developed decision rule for herbicide rate. It was found that when the size of the decision unit was 15 m × 15 m (the size of an ASTER pixel), a reduction in herbicide use of at least 50% would be achieved in one out of every two of the fields, and a reduction of at least 33% would be achieved in all fields. When the size of the decision unit was 30 m × 30 m, a reduction of at least 33% would be achieved in one out of every two of the fields. In conclusion, satellite-based crop reflectance measurements can be used instead of ground-based measurements for determining herbicide rate for potato haulm killing. When the size of the decision unit is not larger than 30 m ×30 m, a 50% reduction in herbicide use for potato haulm killing can be achieved with VRA
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