This ebook investigates new agricultural platforms resembling natural and eco-friendly manuring, in addition to built-in pest administration practices, and appears at how they could increase farm productiveness opposed to the improvements for the surroundings. a lot of the data provided specializes in microinvestigation of the soil, and at the results of soil variability inside of fields on yields and nutrient flows.
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Additional info for Ciba Foundation Symposium 210 - Precision Agriculture: Spatial and Temporal Variability of Environmental Quality
J Soil Sci 41:473-490 Wagenet R J, Bouma J 1993 Introduction to operational methods to characterize soil behaviour in space and time. Geoderma 6O:vii-viii Webster R, Beckett PHT 1968 Quality and usefulness of soil maps. Nature 219:68&682 Wosten JHM, Bouma J, Stoffelsen GH 1985 Use of soil survey data for regional soil water simulation models. Soil Sci Soc Am J 49:1238-1244 Zinck J A 1990 Soil survey: epistemology of a vital discipline. ITC Journal 4:335-350 DISCUSSION Barnett: The question of where one should measure pollution is a vital consideration.
In principle, model bias should be smaller with mechanistic models than with functional models because the latter simplify the representation of the actual processes more than the former. But Addiscott (1993) reported that functional models often give simulations that are at least as good as those of mechanistic models. One reason that is invoked is that models of water flow or soil behaviour are often used at scales much larger than the scale at which they were developed. Then the so-called mechanistic models cease to be fully mechanistic (Beven 1989, Addiscott 1993).
The farmer who has a buffer zone might be better off than the farmer who doesn’t, or perhaps the farmer who has a buffer zone is helping out a farmer who doesn’t, because he’s higher up in the catchment. 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?