References of "Aspects of Applied Biology"
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See detailModelling the spray drift by a modified Gaussian tilting plume model.
Stainier, Charles; Robaye, Vincent ULg; Schiffers, Bruno ULg et al

in Aspects of Applied Biology (2006), 77(2), 281-287

The increased concern about environmental effect of pesticides use has resulted in abundant research on spray drift. Spray drift modelling has been developed to get a better understanding of the ... [more ▼]

The increased concern about environmental effect of pesticides use has resulted in abundant research on spray drift. Spray drift modelling has been developed to get a better understanding of the parameters involved and better estimation of the off-target spray deposit. Two groups of models have received extensive a.ttention: Random-walk and computational fluid dynamics (CFD) models have been used to predict the effect of: nozzle height, spray pressure, wind speed,... and were v.alidated with wind tunnels trials. Statistical models based on field trials results have been developed to estimate off-target spray deposit for different sprayers in various environmental conditions. A third group, Gaussian dispersion models, have received early attention in spray drift modelling but are not so popular, despite their international success in environmental pollution modelling. The adaptation of such a model to ground spraying is proposed. The nozzle droplet size distribution measured with a Malvern laser particle analyser is used to divide the nozzle output into several size classes. The spray deposit (or footprint) of each diameter class is computed. The summation of these footprints results in the global drift of the nozzle. The methodology is applied to derive the drift of a.flat fan nozzle located in a wind tunnel and the potential of this approach is discussed. [less ▲]

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See detailExperimental evaluation of a spray drift Gaussian tilting plume model.
Stainier, Charles; Robaye, Vincent ULg; Destain, Marie-France ULg et al

in Aspects of Applied Biology (2006), 77(2), 365-370

This paper evaluates the application of a Gaussian tilting plume model to study agricultural spraying drift. The spray drift deposit of each droplet diameter class, measured by a laser particle analyser ... [more ▼]

This paper evaluates the application of a Gaussian tilting plume model to study agricultural spraying drift. The spray drift deposit of each droplet diameter class, measured by a laser particle analyser, is computed independently and summed to give footprint results for different nozzle. The methodology is used to model the drift from a fiat fan nozzle operating in a wind tunnel. Discrepancies with experimental data and the potential for further improvement of this approach are discussed. [less ▲]

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See detailSpray pattern simulation model for standardisation of boom behaviour tests.
Lebeau, Frédéric ULg; Bouchat, X.; Ruter, R. et al

in Aspects of Applied Biology (2002), (66),

Simulation models of spray pattern are required for the dynamic behaviour assessment of sprayer booms. The reasons are their ease of use and their independence regarding variable operating conditions such ... [more ▼]

Simulation models of spray pattern are required for the dynamic behaviour assessment of sprayer booms. The reasons are their ease of use and their independence regarding variable operating conditions such as liquid properties and nozzle state, which interfere with the discrimination between various dynamic behaviours properties. Although such models have been developed for many decades, no international consensus has been reached on their use in a standardised test procedure. A consensual model is tested in the scope of standardisation specific needs. It uses ISO-5682/1 spray table measurements of the static distributions to compute three 2-D distribution at three heights using a filtered back-projection algorithm. These distributions are interpolated to generate a 3-D matrix of repartition at various heights. This 3-D matrix is used as nozzle distribution description in a dynamic distribution model where the dynamic distribution is computed as a summation of the static distribution at successive positions. The model kernel was found suitable to predict the repartition under a moving boom. [less ▲]

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See detailTiming of nitrogen application to improve quality, reduce lodging and minimise disease risks for hybrid and inbred wheat.
Bodson, Bernard ULg; Vancutsem, Françoise ULg; Falisse, André ULg

in Aspects of Applied Biology (2001), (64), 193-200

In Belgium results of many trials carried out during the last seven years show the possibility of changing timing of nitrogen application with dose reduction during tillering and transfering this amount ... [more ▼]

In Belgium results of many trials carried out during the last seven years show the possibility of changing timing of nitrogen application with dose reduction during tillering and transfering this amount to flag leeaf application; with this nitrogen dressing, grain proteins are higher and lodging and diseases risks are lower. [less ▲]

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See detailHybrid wheat - a different wheat crop?
Bodson, Bernard ULg; Franc, Jean; Destain, Jean-Pierre ULg et al

in Aspects of Applied Biology (1997, December 15), (50), 23-30

From 1994 to 1996, trials have been carried out in Gembloux (Belgium) to evaluate the agronomical value of hybrid wheat varieties and to determine the best adapted growing conditions for these new wheats ... [more ▼]

From 1994 to 1996, trials have been carried out in Gembloux (Belgium) to evaluate the agronomical value of hybrid wheat varieties and to determine the best adapted growing conditions for these new wheats. These experiments show that the best hybrids have a yield potential hyghly superior to classical varieties. In order to improve the cost-effectiveness of hybrid wheat crops, a reduction in seed rate may be possible together with changes in nitrogen fertilisation, if the results of preliminary studies are confirmed. [less ▲]

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