Joint International Conference on Long-term Experiments ...

pH values
pH values
8
6
pH values
6.50
6.00
5.50
5.00
4.50
4.00
N rates kg/ha
Background P0
y = 7E-06x 2 - 0.0076x + 6.2034
R 2 = 0.9957
N0 N40 N80 N120 N160
4
0 40 80 120 160
8
6
N rates kg/ha
Background P80
y = -3E-05x 2 - 0.0015x + 5.9257
R 2 = 0.9951
4
0 40 80 120 160
N rates kg/ha
pH values
160
8
6
80
0
P rates kg/ha
Background P40
y = -0.006x + 6.06
R 2 = 0.9965
4
0 40 80
N rates kg/ha
120 160
8
6
Background P160
y = -3E-05x 2 - 0.0009x + 6.0611
R 2 = 0.9982
4
0 40 80 120 160
N rates kg/ha
Figure 1: Influence of nitrogen and phosphorus on preluvosoil reaction from N-W part
of Romania
The lower values of pH was registered in the case of plots fertilized with P80, when was
obtained the higher level of production.
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