“…In soil analysis, various methods were reviewed (171), methods for the analysis of soils and biological materials were described (221), a direct current arc total-energy method is used in plant nutrition and soil investigation (225), and the determination of trace elements after extraction from soils is reported (214). Methods employed at the Macaula)^I nstitute for Soil Research are reviewed (173) and analyses of plant materials, water, and soil extracts in plant nutrition studies are described (244).…”