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The sue salinitylo is a limiting factor in the management of sports surfaces. Until the 1950s this was analysed through the test of saturated pasteHowever, the use of soil:water suspensions at different ratios such as 1.1, 1:2, 1:5 and 1:10 is a quicker and easier process than obtaining saturated paste.
Studies have been carried out on different soil textures: sandy, loamy and clayey, in order to correlate the results and arrive at the values that a saturated paste test would provide, Sonmez et al., 2008.
Soil:water Regression equation r²
Sandy soil
1:1 ECe (dSm‾¹) =2.42 x 0.98
1:2.5 ECe=4.41 and 0.99
1:5 ECe=7.98 z 0.98
Thus, the measurement of 1 dS/m in EC measured in a 1:1 soil:water suspension is the same as 2.42 dS/m measured in saturated paste. Remember that the tolerances of the different varieties are recorded in the bibliography in units measured in saturated paste tests and therefore, if the results are given by other tests, it is necessary to know their equivalence to the reference test.
Loam soil
1:1 ECe=2.06 x 0.99
1:2.5 ECe=3.96 and 0.99
1:5 ECe=7.62 z 0.99
Clay soil
1:1 ECe=1.96 x 0.99
1:2.5 ECe=3.75 and 0.99
1:5 ECe=7.19 z 0.98
Likewise, the concentrations of the different solutes in these different soil:water surfaces correlated with those of saturated paste have been determined according to the following table (we show only those with a sandy texture typical of greens):
Parameter regression equation r²
1:1 soil:water suspensions
EC, dSm‾¹ SP=2.42 x 0.98
Cl, mel‾¹ SP=3.33 x 0.92
K, mel‾¹ SP=1.31 x 0.41
Na, mel‾¹ SP=2.55 x 0.99
Ca, mel‾¹ SP=3.14 x 0.59
Mg, mel‾¹ SP=4.88 x 0.97
Thus, if we measure the Chlorine in a 1:1 soil:water suspension and there is 1 me/l of Cl, this is the same as saying that there are 2.55 me/l measured in saturated paste.
Suspensions 1.2.5 soil:water
EC,dSm‾¹ SP=4.41 y 0.99
Cl, mel‾¹ SP=6.02 and 0.99
K, mel‾¹ SP=2.49y 0.81
Na,mel‾¹ SP=4.48y 0.99
Ca,mel‾¹ SP=5.36y 0.99
Mg,me‾¹ SP=10.52y 0.99
1:5 soil:water suspensions
EC,dSm‾¹ SP=7.98z 0.98
Cl,mel‾¹ SP=10.24z 0.98
K,mel‾¹ SP=3.08z 0.67
Na,mel‾¹ SP=8.42z 0.99
Ca,mel‾¹ SP=9.75z 0.97
Mg,mel‾¹ SP=16.40z 0.96
Based on the highly correlated results with the regression equations obtained, it can be concluded that the 1:1, 1:2.5 and 1:5 soil:water extracts can be used to estimate the conductivity of the saturated paste extract and the concentrations of the different soil solutes. There are also correlations for loam and clay soils. This strategy serves to perform the tests faster and at lower analytical cost. A benefit of using the 1:2.5 soil:water suspension is that it can also be used for the measurement of the pHIt is also the one with the lowest error in the potassium calculation. However, the highest accuracy will be given by the saturated slurry test itself.
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4 responses
Excellent article.
In this, we farmers get confused with the values of conductivity conversion.
E.g. the Colombian Standard has other conversion values according to the soil water ratio 1:2 1:5.
Interesting
This issue is very important because some laboratories do NOT indicate the soil water ratio, so it is possible to fall into the error of not correlating it by the factor for the equivalence in saturated paste.
It is important to note that the determination of pH depends on the type of soil, if the soil is very acidic, the determination should be made with a neutral salt, such as potassium chloride 0.1 molar, due to the salt's stability to hydrolysis.
greetings and thank you for allowing me to have my say.
Thank you very much for the clarification. We are very pleased that everyone is doing their bit.
Best regards.