Evolution of the analytical quality of soil testing laboratories integrated in a sample exchange program

J. A. Quaggio Institute Agronômico, Caixa Postal 28, Campinas, SP, 13001–970, Brazil

H. Cantarella Institute Agronômico, Caixa Postal 28, Campinas, SP, 13001–970, Brazil

B. van Raij Institute Agronômico, Caixa Postal 28, Campinas, SP, 13001–970, Brazil

References

Quaggio , J. A. , van Raij , B. and Malavolta , E. 1985 . Alternative use of the SMP‐buffer solution to determine lime requirement of soils . Commun. Soil Sci. Plant Anal. , 16 : 245 – 260 .
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Raij , B. van , Quaggio , J. A. and da Silva , N. M. 1986 . Extraction of phosphorus, potassium, calcium and magnesium from soils by an ion‐exchange resin procedure . Commun. Soil Sci. Plant Anal. , 17 : 547 – 566 .
Web of Science ®Google Scholar

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