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FIGURE 1-7 In agroecosystems crop yield is affected by groundwater depth, which in turn is affected by the use of water by plants. To identify groundwater depths that optimized crop yield, the authors combined data on corn, soybean, and wheat yields with topographic maps and groundwater-depth sampling. In this figure, piecewise regressions with two breakpoints were used. SOURCE: Reprinted, with permission, from Nosetto et al. (2009). © 2009 by Elsevier.

with different temperature and humidity relative to, say, a concrete parking lot and so affect the behavior of the atmosphere. Furthermore, soil properties affect how readily water and nutrients can be taken up from the soil by plant roots but again the growth of the roots themselves changes the soil structure, which is relevant to vadose zone hydrology, the subdiscipline concerned with water in soils.



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