Fig. 4. Aeration, as calculated using the landfarm aeration model (left) and the field observations (right). Arrows connect calculated and observed situations. (A) Landfarm with roots in the upper 25 cm in the first year and roots in the upper 50 cm in the second year. Aeration as observed in the vegetated landfarm of Petroleum Harbor sediment. (B) Active cultivation in the first year and passive landfarming in the second year. Aeration as observed in the cultivated landfarm of Petroleum Harbor sediment.