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CERAMIC CUP EXTRACTORS AND DILUTE SOLUTIONS FOR SOIL SALINITY DETERMINATION
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 012170, 2001 ASAE Annual Meeting. @2001
Authors: Ênio Farias de França e Silva, Sergio Nascimento Duarte, Rubens Duarte Coelho
Keywords: salinity, electric conductivity, suction cups
The objective of this work was to evaluate the possibility of using porous ceramic cup extractors and the dilute solution technique 1:2 (distilled dry soil:water) to quantify the soil salinity, correlating the electrical conductivity (EC) values obtained by these methods with the standard method (saturation paste extract). An experiment in laboratory was carried out using soil conditioned in pots irrigated with water concentrations of 1.0; 2.5; 4.0 and 5.5 dS.m -1 and leaching fractions of 10% and 30% of evapotranspiration , resulting in different levels of soil salinization. Electrical conductivity was measured in the saturation extract (ECe), in 1:2 solution (EC1:2) and in soil solution collected through porous cups at soil moisture level near to the field capacity of the soil contained in the pots (ECscp). The values of ECscp overestimated 19.35% of the average ECe measured before the moisture correction. After the correction of the different soil moisture levels, the values obtained with the cups extractors presented a close relationship (1:1) with the ECe values, with a r 2 =0.93. EC1:corresponded to 15.48% of ECe, before the moisture correction. However, when the electrical conductivity corrections in function of the moisture levels were accomplished with average values they were 18% higher than ECe values, possibly due to the solubility of calcium carbonate.