(2) Partial correlation coefficients

Ryx1 × x<sup>2</sup> = 0.881 (strong, positive, direct relationship)—characterizes the value of the net impact of dry substance content in agricultural crops (kg/t) on the yield of biogas from different crops, provided that the factor of the potential share of methane production from the crop (m3/t) is eliminated;

Ryx2 × x<sup>1</sup> = 0.980 (strong, positive, direct connection) characterizes the value of the net impact of the potential share of methane production from agricultural crops (m3/t) on the yield of biogas from different crops, provided that the factor of dry substance content in agricultural crops (kg/t) is eliminated.
