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There was a significant increase in nitrate-N comparing to control after N fertilizer
adding, while biofertilizer doses decreased (not significantly) the nitrate concentrations
on the sandy soil (Figure 4).
1
0,8
0,6
0,4
0,2
0
B1 B2 B3
N1 N2 N3 N4
Figure 4: Effect of nitrogen and bio-fertilization on nitrate-N on
sandy soil (LSD5% (N): 0.36 LSD5% (B): 0.31)
Based on data from experiment, it can be concluded that positive effect of
biofertilization on yield, N content of plant and soil displayed only on chernozem soil
during that short period of investigation. On the acidic soil with low organic matter
content, these effects are no appeared because of N immobilization by microbes.
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