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 424700
Title Using crop reflectance to determine sidedress N rate in potato saves N and maintains yield
Author(s) Evert, F.K. van; Booij, R.; Jukema, J.N.; Berge, H.F.M. ten; Uenk, D.; Meurs, E.J.J.; Geel, W.C.A. van; Wijnholds, K.H.; Slabbekoorn, J.J.
Source European Journal of Agronomy 43 (2012). - ISSN 1161-0301 - p. 58 - 67.
DOI http://dx.doi.org/10.1016/j.eja.2012.05.005
Department(s) PPO/PRI AGRO Duurzame Bedrijfssystemen
Team Internationale Productie & Gewasinnovatie
Agrosystems
PPO AGV Team Bodemkwaliteit
Team Bodemkwaliteit
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) nitrogen status - fertilizer nitrogen - light reflectance - chlorophyll meter - vegetation index - management - soil - sensor - corn - recommendations
Abstract A low basal N application combined with in-season adjustment of the sidedressNrate has been proposed as a means to saveN in growing potato (Solanum tuberosum L.). We hypothesize that a measurement of canopy reflectance provides information which can be used to adjust sidedressNrate. The objective of our work was to develop and test a canopy reflectance-based Nsidedress system for potato in humid climates. In four years of experiments with ware potato on a sandy soil it was determined that the reflectance index WDVI correlates well with N uptake, that sidedressN should be applied at around the time of canopy closing, and that the sidedressNrate should be calculated as the difference between a (fixed) desired N uptake and a reflectance-based measurement of N uptake. The calculated N saving in these experiments was between 10 and 109 (average 56) kg N ha-1. The reflectance-based Nsidedress system was tested at an additional two locations, with ware potatoes on a loamy soil and with starch potatoes on a sandy soil, in two further years of experiments. N saving in these experiments was between 8 and 88 (average 44) kg N ha-1. In both sets of experiments, yields with the sidedress system were generally at the same level as yields obtained with recommended Nrates (basal N only). We conclude that the reflectance-based sidedressN system allows saving of N while maintaining yield
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