vars	size	correlation
P	1	0.25163022609618835
P, Al	2	0.4003778484896049
P, Ca, Al	3	0.4004805867496183
P, Ca, pH, Al	4	0.3618749732452448
log(N), P, Ca, pH, Al	5	0.3215524892624249
log(N), P, K, Ca, pH, Al	6	0.2821814757209515
