J. Vos | Wageningen University (original) (raw)

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Papers by J. Vos

Netherlands Journal of Agricultural Science

Three greenhouse trials and one field trial were carried out on Brussels sprout cv. Icarus SG2004... more Three greenhouse trials and one field trial were carried out on Brussels sprout cv. Icarus SG2004 in which the treatments consisted of different N amounts and application dates. DM and N accumulation in stems, apical buds and groups of leaf blades, petioles and sprouts were measured frequently throughout crop growth. Total amounts of accumulated DM and N were affected by amount of N applied and date of application, but the final harvest indexes for DM and N (0.10-0.35 and 0.20-0.55, respectively) were not significantly affected by treatments in most experiments. Nitrate N concentrations were only high (up to about 2%) shortly after planting. The total N concentration of leaf blades and petioles increased with increasing leaf number. This increase resulted from a decreasing N concentration during the leaf's life. The total N concentration in sprouts changed little with leaf number.

Plant Pathology, 1995

... Huisman OC, Ashworth LJ Jr, 1974. Quantitative assessment of Verticittium albo-atrum in field... more ... Huisman OC, Ashworth LJ Jr, 1974. Quantitative assessment of Verticittium albo-atrum in field soils: procedural and substrate improvements. Phyto-pathology 64, 1043-4. Huisman OC,Ashworth LJ Jr, 1976. ... Ptant Palhotogy (Submitted). Nadakavukaren MJN, Homer CE, 1959. ...

Plant and Soil, 1986

... Summary In 1982 and 1983 root samples were taken by auger from potato crops grown on marine c... more ... Summary In 1982 and 1983 root samples were taken by auger from potato crops grown on marine clay in the Flevo-Polder. The roots increased ... management. The potatoes were grown on marine clay in the Flevo-Polder. This is ...

Photosynthesis Research, 1987

New Phytologist, 2010

Lodging, the permanent displacement of crop plants from their vertical because of root or shoot f... more Lodging, the permanent displacement of crop plants from their vertical because of root or shoot failure, is a major yield constraint of the gluten free, panicle bearing cereal teff. The objective of this paper was to analyse the causes of lodging of teff by using, modifying and validating conventional biomechanical models. The model parameters were obtained from a field trial with two contrasting teff cultivars, using novel in situ and laboratory measurements under wet and dry conditions. Cross-species model validation was done with rice (Oryza sativa). Teff is more susceptible to root lodging than to shoot lodging, although the data indicated that shoot strength is also insufficient. Hence, simultaneously breeding for both improved root anchorage and shoot strength is advocated. The study showed that the lodging model, derived for the spike-bearing cereal wheat, needed modifications in order to be able to deal with panicle-bearing plants such as teff and rice. Water adhering to plants owing to rain or dew increased calculated lodging susceptibility. To prevent underestimation of lodging susceptibility, future lodging research should be done under completely wet conditions (water saturated soil and wetted shoots).