After the summer of the second year of growth the plant produces seeds. One individual can produce 100,000 to 180,000 seeds. These seeds are released in close proximity to the plant and can remain viable for over 100 years. The invasive common mullein prefers dry and sandy soils, but is adaptable to many soil types.
primary porosity. (geology). Natural porosity in petroleum reservoir sands or rocks. 1  Facebook. 2  Twitter.rimary porosity. (geology). Natural porosity in petroleum reservoir sands or rocks. 1  Facebook. 2  Twitter.
Table 3.1 lists representative total porosity ranges for various geologic materials. A more detailed list of representative porosity values (total and effective porosities) is provided in Table 3.2.In general, total porosity values for unconsolidated materials lie in the range of 0.25-0.7 (25%-70%).n the basis of the definition of total porosity, a soil sample could be evaluated for total porosity by directly measuring the pore volume (Vp) and the total volume (Vt). The total volume is easily obtained by measuring the total volume of the sample.