Joint International Conference on Long-term Experiments ...

Table 5: N content in plant on sandy soil
Leaf N content (%)
Phylazonit doses (cm 3 pot -1 N (g pot
)
-1 )
80 40 0
Mean LSD5% (N)
0.2 3.2 2.8 2.8 2.9
0.1 2.5 2.5 3.2 2.7
0.05 2.1 2.4 2.0 2.2 0.4
0 1.9 1.9 2.6 2.1
Mean 2.4 2.4 2.6 2.5
LSD5% (phylazonit):0.3
Between two soils there was a remarkable difference: in case of acidic sandy soil, the
adding of biofertilizer caused an increase in both plant biomass and in N content of leaf.
These effects are not appeared for chernozem. Due to the very low N supply ability of
sandy soil, the increment of microbes amount due to biofertilization may cause N
immobilization, because the enhanced microbial biomass take up soluble N.
To take further investigation on this problem, 0.01 M CaCl2 soluble total N and nitrate
was measured from soil samples taken at the end of growing period. Both N fertilization
and biofertilization significantly increased the soluble total nitrogen concentration on
the chernozem soil (Figure 1).
25
20
15
10
5
0
B1 B2 B3
N1 N2 N3 N4
Figure 1: Effect of N and biofertilization on 0.01 M CaCl2 soluble
total N content of chernozem (LSD5% (N): 2.90 LSD5% (B): 2.51)
316