Table 3 Mean ± standard error and two-way ANOVA results for each soil parameter measured in eight localities in central Mexico

pH

10.60***

2.21**

6.65 ± 0.05

OM

17.96***

1.65 ns

6.02 ± 0.37

%

NH₄

5.68***

1.91**

15.32 ± 0.74

ppm

NO₃

3.09***

2.13**

9.92 ± 0.28

ppm

PO₄

26.77***

2.32***

2.89 ± 0.18

ppm

N _t

11.82***

1.65 ns

0.41 ± 0.02

%

P _t

14.13***

1.71 ns

0.07 ± 0.01

%