By Donald L. Sparks
Advances in Agronomy remains to be well-known as a number one reference and a primary resource for the most recent learn in agronomy. As continually, the themes coated are diverse and exemplary of the myriad of subject material handled by means of this long-running serial. * continues the top effect issue between serial courses in agriculture * provides well timed stories on vital agronomy concerns * Enjoys a long-standing acceptance for excellence within the box
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Additional info for Advances in Agronomy, Vol. 113
022 mm yr21 and are relatively similar to chemical weathering rates estimated from catchment-based methods (Figs. 6 and 7), although rates derived with weathering indices were generally lower. Rates of total denudation were estimated for all chemical weathering studies based on weathering indices using TCN. Generally, calculated rates of chemical weathering were lower than rates of physical weathering. 1, Part 1 and Part 2) show no distinct pattern of weathering rates being dependent on different climates and parent materials of the sites studied.
2003, 2004a, 2004b), Green et al. (2006), Yoo et al. (2007), Burke et al. (2007), and Burke et al. (2009), total rates of denudation or weathering were substituted with rates of soil production derived with TCN. To estimate the extent of chemical weathering, determined chemical weathering rates (using weathering indices) were subtracted from rates of soil production (using TCN). In the publication of Dixon et al. (2009), however, total denudation rates were calculated by combining determined chemical weathering rates (using weathering indices) and rates of soil production (using TCN).
Green et al. (2006) conducted a study in the Bega Valley in south-eastern Australia to quantify chemical weathering along a hillslope, implementing SPRs of the area as analyzed by Heimsath et al. (2000). They calculated that mass loss by chemical weathering accounted for 35À55% of the total mass loss from the hillslope. Results from Burke et al. (2007) indicated a decrease of chemical weathering of saprolite with increasing overlying soil thickness. At the study site Point Reyes in California, USA, chemical weathering accounted for 13À51% of total denudation rates.