Joint International Conference on Long-term Experiments ...

CaCl2- NO3 - -N (mg kg -1 )
9
8
7
6
5
4
3
2
1
0
5.7
6.1
5.8
7.0
5.5
0.4 0.4 0.6 0.6 0.5 0.8
Control
N0+phyl
Újftó
Látókép
N1
N1+phyl
N2
N2+phyl
8.1
N3
2.0
7.2
2.2
N3+phyl
Figure 2. Mean NO3 - - N (mg kg -1 ) measured in CaCl2 soil extracts from Látókép
and Újfehértó as influenced by N and phylazonit application rates. For interpretation
of treatments see Table 2.
totalN(mg kg -1 )
16
14
12
10
8
6
4
2
0
4.1
Control
11.3
3.7
N0+phyl
12.7
N1
Újftó
Látókép
4.0
11.7
3.8
N1+phyl
12.7
N2
4.5
14.3 14.7 14.5 14.8
4.2
N2+phyl
N3
8.5
6.0
N3+phyl
Figure 3. Mean total N (mg kg -1 ) measured in CaCl2 soil extracts from Látókép and
Újfehértó as influenced by N and phylazonit application rates. For
interpretation of treatments see Table 2.
By the end of the growing season nitrate content of sandy soil becomes very low (0.4-
0.8 mg kg -1 ). Only with the application of highest N doses (0.2 g pot -1 ) caused increased
CaCl2-NO3 - values (2.0-2.2 mg kg -1 ). This increasing effect of N doses on NO3 - content
was significant. We measured higher concentrations of NO3 - by turns on chernosem soil.
This might be due to higher content of organic matter which could mineralize during the
growing season. Both N doses and biofertilization significantly increased the CaCl2-
NO3 - on chernozem soil. The effect of chemical fertilizer was higher. Measured data
show that similarly to CaCl2-NO3 - , the values of CaCl2-total N were higher in
324
8.2