N2 fixation by two lupine species under different soil management systems. Transfer of fixed N2 from legume to intercropped eucalyptus.

The rate and pattern of symbiotic fixation and N credit by white lupine as affected by soil tillage, and yellow lupine affected by soil amendment with eucalyptus harvest residues were evaluated; also, fixed N transferred from yellow lupine to the intercropped eucalyptus was assessed. Lupine species growing in sandy soils with low nutrient status fixed >94% N2 with the indigenous soil rhizobium, in two sites (Pegoes, Obidos). Soil disturbance and...