Joint International Conference on Long-term Experiments ...

Table 2: Combinations of treatments
Number of
combination
N treatment
(mg kg -1 )
Ni treatment
(mg kg -1 )
CaCO3
treatment code (!)
1. 80 0 0
2. 80 50 0
3. 80 100 0
4. 80 0 1
5. 80 50 1
6. 80 100 1
7. 160 0 0
8. 160 50 0
9. 160 100 0
10. 160 0 1
11. 160 50 1
12. 160 100 1
(!) 0 = without CaCO3 1 = CaCO3 dose according to calculated lime requirement
Plants were cut two times, 33 and 61 days after sowing, the grass yield was dried at
60ºC until reaching constant mass in a desiccator and the dry matter production per pot
was measured by analytical balance.
RESULTS AND DISCUSSIONS
The obtained results were evaluated by a three-variate analysis of variance on the basis
of Sváb’s method (1981). In the analysis of variance, F and SD 5 % values were
calculated for each factor and for each double and triple interaction, then the
significance levels were determined.
Summarized yields of the two cuts and their statistical evaluation on chernozem
and sandy soils are shown in Tables 3 and 4.
On the chernozem soil at Látókép, it can be stated when considering the sum of dry
matter production of two cuts that nitrogen had a significant effect on yield (P = 0.1 %).
Nitrogen supply had a different effect in the different lime and nickel combinations.
This is indicated by the fact that the N*Ni*CaCO3 triple interaction was significant at
P = 5.0 % level, meaning that factors (in our case nitrogen) exert their effect depending
upon the other factors.
In combinations not treated with calcium carbonate, the yield-increasing effect of
nitrogen could be observed at all three nickel dosages, however this effect was
decreasing with increasing nickel dosages. Whereas in limed treatments, the increasing
nickel dosages do not limit the yield-increasing effect of nitrogen.
The yield-reducing effect of Ni is not significant on this soil in the sum of the two cuts
as confirmed by the statistical analysis.
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