[1]
N 2 fixation by red alder ( Alnus rubra ) and scotch broom ( Cytisus scoparius ) planted under precommerically thinned Douglas-fir ( Pseudotsuga menziesii )[J] . O. T. Helgerson,J. C. Gordon,D. A. Perry.Plant and Soil . 1984 (1)
[1]
N 2 fixation by red alder ( Alnus rubra ) and scotch broom ( Cytisus scoparius ) planted under precommerically thinned Douglas-fir ( Pseudotsuga menziesii )[J] . O. T. Helgerson,J. C. Gordon,D. A. Perry.Plant and Soil . 1984 (1)