The effect of Lupinus arboreus on the nitrogen status of china clay wastes.
Lupinus arboreus rapidly colonizes micaceous china clay wastes, which are deficient in N, P, Ca and K. N accumulated at rates of about 180 Kg ha-1y-1 on areas where L. arboreus was established. The concentration of total, inorganic and mineralizable N increased in these soils. Non-legume species colonized the soil beneath L. arboreus and apparently benefited from the increased soil N status. L. arboreus is tolerant of soils with low concentrations of major plant nutrients; this, and its ability to fix atmospheric N, makes it a suitable pioneer species for reclaiming wastes of low fertility.