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Figure 2: Relationship between the yield and the constant of the mineralization (k)
From obtained values of Npot it was evident that liming improves the conditions of
mineralization of soil. It can be explained by higher microbiological activity and higher
pH of the soil (Kátai et. al. (1999)). Furthermore the mineralization potential of soil is
depended not only the actual mineralized N content and pH of soil but the amount of
easily soluble, low molecular weighted and mobilizable organic N fraction as well.
From the results it was evident that the used modified incubation method is a reliable
tool plan and implement of professional N supplement.
Results of chemical analysis can be compared to the yield as well (Figure 3.).
N (mg/kg)
k value
12
10
8
6
4
2
0
0,066
0,064
0,062
0,06
0,058
0,056
0,054
0,052
Control N1 N2 N3 NPK Limed
Nmin
Norg
Yield
k
yield
Control N1 N2 N3 NPK Limed
Figure 3: Relationship between the yield and the 0.01 M CaCl2 soluble mineral and
organic N
232
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Yield (t/ha)
Yield (t/ha)