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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 enhance farm productiveness opposed to the improvements for the surroundings. a lot of the data provided makes a speciality of microinvestigation of the soil, and at the results of soil variability inside fields on yields and nutrient flows.

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The study of Trambouze (1996) is an example where the major factor of variation in a soil moisture regime is the spatial distribution of roots as related to the planting geometry and to the variation in compactness of the soil. It illustrates two main difficulties for representing the spatial variation in soil moisture regimes at the field scale. First is the difficulty of simulating the average soil moisture regimes at the scale of the management unit. In a vineyard the management units are the vinestocks and their rooting zones.

The same is true of plant diseases: there are diseases of crops that are doing well and also of crops that are doing badly. In other words pests, diseases and weeds may have a flexible response that is not present in plants and crops. I would like to summarize what we have been discussing this morning in nine points. SPATIAL VARIABILITY OF SOIL MOISTURE RECIMES 37 We discussed the necessity of clarifying the level at which you are making your decisions: whether these are strategic, technical or operational decisions.

In fact, because of the local heterogeneities and the fact that the extent of the rooting system of a given vinestock is unknown, it is very difficult to define at which scale soil water conditions should be measured. So we can’t avoid studying the scales of heterogeneity in soil properties. Burrough: It also means you have this problem of relating a point measurement of some index of plant performance. McBrutney: I guess what Arnold Bregt is saying is that each different kind of plant has some kind of integral scale, and it is much bigger for a vine than for a wheat plant.

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