Diagnosing potassium deficiency by soil analysis
A. L. Brown, Agricultural Experiment Station
James Quick, Agricultural Extension Service and Gerard
Gerard J. De Boer, University of California
California Agriculture 27(6):13-14.
Soil analysis, especially nitric acid extraction of potassium appears to be a very useful means of diagnosing potassium-deficient soils in California. Studies reported here compared two analytical methods for determining soil potassium levels. Plant growth responses were determined by greenhouse pot tests.
A. L. Brown is Lecturer and Specialist in the Agricultural Experiment Station; James Quick is Agriculturist, Agricultural Extension Service and Gerard; J. de Boer is Staff Research Associate. University of California Davis;