Cotton phosphate fertilization: New soil test provides reliable and easily applied diagnostic guide to quantity of available phosphate
California Agriculture 9(1):7-15.
Published January 01, 1955
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A new soil test that tells how much phosphorus in the soil is available to crops—recently developed at the U.S.D.A. Western Regional Phosphate Laboratory—uses a sodium bicarbonate—baking soda—solution to extract the soil phosphate.