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Additional resources for Ciba Foundation Symposium 210 - Precision Agriculture: Spatial and Temporal Variability of Environmental Quality
Should the farmer who doesn’t have the buffer zone pay the farmer who does? O n a certain basis, you might want to say that a fair unit of evaluation is at the field scale, but how do you measure the environmental performance at the field scale? Can we use models to answer this SPATIAL VARIABILITY OF SOIL MOISTURE REGIMES 33 question? Can we use our models as regulatory tools? I know that there are people in this room who, if they are given some input data, will be able to tell us the herbicide output as a percentage of that applied.
However, in your vineyards there are obviously some vines that d o very well and others that grow poorly. Couldn’t you g o in and look at vines that are doing well and measure, for example, the soil characteristics, root structures and moisture regimes of these to derive rules for managing the other vines, rather than modelling all of the vineyard? :I agree in principle, but the problem with vineyards is that vinestocks grow for 40 years, after which they are usually replaced. This means that when the farmer manages his land he has to take into account what has been done previously, often by SPATIAL VARIABILITY OF SOIL MOISTURE REGIMES 35 the former generation.
We denote the sample estimate of the dispersion between the ith andjth monitoring sites by dqi and the fitted dispersion between the ith a n d j t h monitoring sites by d.. - yg (1) f ( x i ) - ] ( x j ) 11). For analysis and modelling we usually standardize the siteh specific time series to variance 1, in which case we can compute dq = 2(1- rg),where rq is the empirical correlation between the observations at sites xi and xj We refer to the geographic coordinate system as the G-plane, and the transformed coordinate representation as the D-plane.