However, in the case of Yellow soils, the subsoil organic carbon storage was lower than in the A-horizon soil because of the higher SOC content of A-horizon soils, thinner soil thickness of B-horizon soils and weaker leaching compared with other soils.

SOC storage in B-horizon soils was much higher than in A-horizon soils (0.040 vs 0.026 kg C [m.sup.-2] respectively).

In this area, excavations revealed an intact non-culturally modified A-horizon with an underlying B-horizon. Nutrient analysis from Garden 06-5 and the adjacent non-garden area exhibited a similar pattern to Garden 06-4.

30 by 10 m area of the garden revealed a churned gardening Ap-horizon containing charcoal flecking with an underlying undisturbed B-horizon. The non-garden samples were taken from a zone ca.

1999) and therefore increase EC and ESP in the B-horizon. Meanwhile some late season rainfall (Fig.

Such reductions in penetration resistance in the deep-ripped soils at both sites reflect greater opportunities for water transmission to depth, despite the fact that the reductions in penetration resistance caused by deep-tipping were not reflected in measurements of dry bulk density or macroporosity at the interface between and A- and B-horizons (data not shown).

to the B-horizon (10ppm) and then increased at the C-horizon (20ppm).

the O-horizon (7.5ppm) to the B-horizon (0ppm) and then increased again

The heavier texture of the B-horizon limited further infiltration and lateral subsurface flow would occur along the A/B interface, which would have allowed for continuing infiltration.

The negative relationship between B-horizon clay and the P load is interesting (Table 6); however, the heaviest B-horizons occurred at the WW1, WW3, and WAL3 sites, all of which had low to very low bioavailable (Bray) P concentrations in the top 30 mm of the soil and thus low P loss potential (Cornish et al.