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 410695
Title Are specific testing protocols required for organic onion varieties? Analysis of onion variety testing under conventional and organic growing conditions
Author(s) Lammerts Van Bueren, E.; Osman, A.M.; Tiemens-Hulscher, M.; Struik, P.C.; Burgers, S.L.G.E.; Broek, R.C.F.M. van den
Source Euphytica 184 (2012)2. - ISSN 0014-2336 - p. 181 - 193.
Department(s) Laboratory of Plant Breeding
Crop and Weed Ecology
Biometris (PPO/PRI)
Team Economie en Nematoden
Team Bedrijfssystemenonderzoek
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) rassenproeven - uien - biologische landbouw - rasverschillen - proefopzet - variety trials - onions - organic farming - breed differences - experimental design - farming systems - performance
Categories Variety Testing, Variety Lists
Abstract Organic growers need information on variety performance under their growing conditions. A 4-year onion variety research project was carried out to investigate whether setting up a variety testing system combining conventional and organic variety trials is feasible and efficient rather than organizing separate variety trials under the two management systems. During 4 years commercial onion cultivars were tested at a certified organic and a non-organic location. Both systems were managed without chemical pest, disease and sprouting control, but differed in fertility management (organic manure in autumn versus synthetic fertilizer), soil cultivation and weed management (mechanical weeding versus application of herbicide). Management system significantly affected plant density, thickness of neck, and proportion of small and large bulbs. Variety × management system interactions were significant for bulb uniformity, earliness, proportion of large bulbs, dormancy and relative storage success but did not change the ranking of the varieties. We conclude that organic growers can profit from a more conscious variety choice when conventionally fertilised trials would refrain from using pesticides, fungicides, herbicides and sprout inhibitors. However, this would require an adaptation of the management protocol in such a way that trials might no longer represent conditions of conventional farmers. Furthermore, assessments of leaf erectness, disease resistance to downy mildew and leaf blight should be included in the protocols for organic use. We advocate better communication between breeders and growers on specific variety characteristics contributing to improving yield stability under low-input, organic growing conditions
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