A field test for available phosphorus in soils
By: by R.H. Bray.
Series: Bulletin (University of Illinois (Urbana-Champaign campus). Agricultural Experiment Station) -- no. 337; Bulletin (University of Illinois (Urbana-Champaign campus). Agricultural Experiment Station) -- no. 337.
Publisher: University of Illinois Agricultural Experiment Station
Published: 1929
Place of publication: Urbana, Ill
Subjects: Soils -- Phosphorus content