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Extra resources for Ciba Foundation Symposium 210 - Precision Agriculture: Spatial and Temporal Variability of Environmental Quality
The next point, which became clear in the last discussion we had, concerned where we should measure pollution. Should we monitor it on a watershed level, a catchment level or on a field level? How can we scale up and scale down from one level to another? We also talked about norm setting. Does this involve dictating means, or merely setting the aims? We agreed that setting aims is much better than regulations that dictate means. Finally, we discussed the rooting depths and rooting systems, knowledge of which are vital for us to develop precision agriculture further.
Rabbinge: For roots 30 m down the suction requirement for extracting water would need to be at least 20 bars. : Yes, it’s a problem. Bregt: We are now talking about the precise measurement of soil variability, and we have discussed the relevance for environment impact, but if you’re looking at crop production, especially when you’re talking about vineyards with deep rooting systems, I get the feeling that the short-range spatial variability may be of minor importance for this type of crop. The crop is integrating or smoothing a lot of spatial 36 DISCUSSION variability in the soil.
The fundamental idea of the non-stationary spatial covariance approach is to compute a deformation of the geographic plane so that the spatial covariance structure can be considered stationary (and isotropic) in terms of a new spatial coordinate system. In recent years the methodology has been developed by a number of authors and applied in analyses of solar radiation (Sampson & Guttorp 1992), acid precipitation (Guttorp et a1 1993, Guttorp & Sampson 1994, Mardia & Goodall 1993), rainfall (Monestiez et al 1993, Meiring 1995), air pollution (Brown et a1 1994) and tropospheric ozone (Guttorp et a1 1994, Meiring 1995).