Fe forms were selectively extracted from the air-dried
fine earth fraction (ADFE, particle diameter <2mm).
Mobile Si contents varied between 0.3 and 28[micro]g [g.sup.-1]
fine earth, whereas contents of adsorbed Si ranged from 1.2 to 39 [micro]g [g.sup.-1].
Soils are divided into two categories:
fine earth and coarse fraction.
The major minerals observed in the
fine earth fractions are shown in Table 6.
Air-dried soil samples were separated into
fine earth and coarse fragment fractions on a 2-mm screen, and ca.
Lead shot corrosion products were observed to develop rapidly into crusts surrounding individual Pb pellets, with concurrent increases in Pb in the soil solution and in the soil
fine earth fraction.
To ensure a steady flow of water, "open" the well by removing the
fine earth or sand particles around the drive pump.
Bulk samples collected from the profile were sieved into five size fractions (<2, 2-4, 4 8, 8 16, and >16mm) to separate rock clasts and Fe nodules of different sizes from the
fine earth fraction.
Total dry ([[rho].sub.t]) and
fine earth (<2 mm) ([[rho].sub.f]) bulk densities were determined.
The aim of our study was to reveal the effects of impervious surfaces in urban areas on SOC, microbial activity, and functional diversity of the
fine earth (<2 mm soil as separated by sieving) under different land-use types.
First,
fine earth dry bulk density (DBD) and available water content (AW) for the soil profiles were calculated using pedotransfer functions (PTFs) from qualitative soil descriptors (e.g.