Adjustment of the expedite method for clay content determination in Rondônia soils.
2011
SCHLINDWEIN, J. A. | MIOTTI, A. A. | FIORELI-PEREIRA, E. C. | PEQUENO, P. L. DE L. | BORTOLON, L. | MARCOLAN, A. L. | JAIRO ANDRÉ SCHLINDWEIN, UNIVERSIDADE FEDERAL DE RONDÔNIA; ALAN ANTONIO MIOTTI, UNIVERSIDADE FEDERAL DO CEARÁ; ELAINE COSMA FIORELI-PERIRA, UNIVERSIDADE FEDERAL DE RONDÔNIA; PETRUS LUIZ DE LUNA PEQUENO, UNIVERSIDADE FEDERAL DE RONDÔNIA; LEANDRO BORTOLON, CNPASA; ALAERTO LUIZ MARCOLAN, CPAF-RO.
Soil clay content is an important soil attribute and has been used to classification of phosphorus status in the soil in order to determinate the needing of phosphorus amounts to be applied to crops production. The aim of this research was to adjust the method for soil clay content determination, adopted by the laboratories of Southern Brazil (ROLAS-RS/SC), for soil clay content evaluation in Rondônia soils. The study was conducted using 50 soil samples from Rondônia State with wide range clay content. It was tested shaking periods (1.5, 2.0 and 2.5h) associated with periods for soil particles decantation (1.5 and 2.0h) to correlate with the standard method for soil texture testing, known as the pipette method. Clay content determined through this method was significantly correlated with pipette method. The better treatment was the combination of 2.0h of shaking and 1.5h of decantation, resulted in total period of 3.5h, which reduced the period to determine the soil clay content without loss of accuracy.
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