Joint International Conference on Long-term Experiments ...

On sandy soil, the total N content increased with increasing N doses, while adding of
biofertilizer to soil caused no significant increase in soil CaCl2-soluble total nitrogen
concentration (Figure 2).
15
10
5
0
Figure 2 Effect of N doses and biofertilization on 0.01 M CaCl2
soluble total N content on sandy soil (LSD5% (N): 3.9 LSD5% (B):
3.37)
Moreover, biofertilizer have a negative influence during the investigated period on
0.01M CaCl2-soluble total N content of sandy soil with acidic character and low content
of organic matter.
The nitrogen fertilization, beside the total N, enhanced the nitrate concentrations in
0.01 M CaCl2 extractions (Figure 3). Biofertilizer also have an increasing effect on
nitrate, but only at high doses of N.
12
10
8
6
4
2
0
B1 B2 B3
N1 N2 N3 N4
B1 B2 B3
N1 N2 N3 N4
Figure 3: Effect of nitrogen rates and biofertilization on nitrate
concentration on chernozem (LSD5% (N): 3.78 LSD5% (B): 3.28)
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