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The 240-page handbook contains detailed information about soil structure and the management practices that affect soils — as well as practical information such as how to interpret soil test results . In order to avoid compaction and breakdown in soil structure and biological viability , topsoil stockpiles should not be greater than one metre high . Capture profiles for reference materials ( gold , tantalum , indium , and silver ) , core materials ( thorium and technetium ) , and structure materials ( manganese and nickel ) were measured with a CeF3 scintillator and photomultiplier for different thicknesses . Soil structure and the amount of petroleum and petroleum waste can further inhibit the transfer of essential nutrients to the indigenous microbial communities capable of degrading these pollutants . " In my experience , non-mainframe environments do n't have that much rigor or structure to them , " Smith said . The number of samples , the geographic coverage of the sampling regime , and the haplotypic diversity will affect our ability to detect population structure . In fact , many conservation designs include planting deep-rooted native plants in the open space to help improve soil structure and increase water infiltration . Consequently , this book could also be employed as a primary or secondary text in a senior-level undergraduate course on molecular structure determination .