ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
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where: a 0 ÷ a 6 are coefficients connected with different soil parameters: θ - water<br />
content determined by the reference thermo-grav<strong>im</strong>etric method, ρ - bulk density,<br />
φ - porosity, ρ s - particle density, C - organic carbon content, clay - clay content in<br />
the analyzed samples.<br />
The analysis of the clay significance in the equation (69) is performed only for<br />
mineral soils (395 cases). Table 12 presents the values of the coefficients a 0 ÷ a 5<br />
and the parameters related to the t-test and F-test for all soil samples.<br />
Table 12. The results of multiple regression analysis for all analyzed soil samples (no of cases -<br />
663)<br />
No.<br />
Regression<br />
parameter<br />
a 0 a 1 a 2 a 3 a 4 a 5<br />
(θ ) (ρ ) (φ ) (ρ s ) (C )<br />
p-value<br />
1 a i 1.491 7.675 – – – –