Joint International Conference on Long-term Experiments ...

Yields of N2K1, N2K2, N2K3 treatments are less than that of NP treatments, yield
increase presents only in case of the largest potassium dose. The N2P2K2 treatment
combinations verify that the supplement of the three elements is necessary, as the yield
increases significantly. Maximum yield can be achieved only by NPK treatments
completed with calcium carbonate. In these treatments soil pH, AL-Ca and AL-Mg
content increase (Figure 1.).
AL soluble Ca (mg/kg)
1200
1000
800
600
400
200
0
Kontroll
N1
AL-Ca
pH
Yield
N2
N3
N2P1
N2P2
N2P3
N2K1
N2K2
N2K3
N2P2K2
N2P2K2Ca2
N2P2K2Mg2
N2P2K2Ca2Mg2
Figure 1: Effect of treatments on triticale yield, the AL-Ca and pH values (0-20 cm)
2. Formation of triticale yield is in accordance with the soil parameters:
AL-Ca values in accordance with the pH values show that in treatments without liming
a great lack of calcium formed as a long-term effect of NPK treatments. Based on
Balogh (1988) investigation and our own experiences if AL-Ca value in soil is smaller
than 100-150mg/kg with lack of calcium has to be accounted, and pH values under 4.5
are also considered as very critical values. According to Iváncsics (1988) if AL-Ca
values in soil is smaller than 120mg/kg the Ca supply level is weak.
As the figures show, in the 0-20 cm soil layer AL-Ca level is under the critical
value in case of N treatments and in the NPK treatments combination.
222
t
7
6
5
4
3
2
1
0
Yield (t/ha)and pH (0.01M CaCl 2)