Soils phosphorus survey

One of the disadvantages of early phosphorus surveys was not long ago, the need to obtain a relatively large number of heavy soil samples, which had to be taken to a chemical laboratory for analysis. In later studies, however, use has been made of portable equipment that makes it possible to analyze, even in the field, very small samples, and statistically appraise the analytical results (Persson 1997). 

Patty Jones, a physical science technician at the NRCS Soil Survey Laboratory, prepares extracts for phosphorus analysis using a diluting device. 

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