Joint International Conference on Long-term Experiments ...

Table 3: Effect of treatments on soil chemical properties in ploughed layer in 2006
and on the cumulative yield of triticale. 2003-2006.
Measured and
Treatments code
LSD5%
calculated characteristics N3 N2 N1 Control NPKMg NPKCa
pH(H2O) 4.6 4.7 5.0 5.4 6.3 6.8 0.3
pH (KCl) 3.5 3.6 4.2 4.3 6.0 6.4 0.5
Hidrolytic acidity (y1) 13.6 12.6 9.6 7.6 4.8 3.6 2.1
Exchangeable cations, meq/100 g
Al 3+ 0.68 0.72 0.67 0.63 0.48 0.40 0.08
Fe 2+ 0.43 0.40 0.32 0.25 0.20 0.15 0.07
Ca 2+ 0.13 0.25 0.41 0.85 1.51 2.18 0.28
Mg 2+ 0.03 0.04 0.08 0.11 0.49 0.05 0.06
Adsorption characteristics
CEC, meq/100 g 3.3 3.4 3.4 3.4 3.8 3.6 0.4
S-value, meq/100 g 0.4 0.5 0.7 1.2 2.2 2.5 0.3
Base saturation, % 12 15 21 35 58 69 8
Exchangeable cations as % of sum of bases (S-value)
Ca 2+ 32 50 57 71 68 88 11
Na + 28 22 14 9 5 4 7
K + 22 16 13 12 6 6 7
Mg 2+ 8 8 11 9 22 2 5
NH4-acetate+EDTA soluble, mg/kg
Fe 152 158 124 104 121 111 25
Al 134 146 123 103 100 103 15
Ca 87 117 161 238 456 767 88
Mg 18 19 25 28 97 22 12
Mn 8 16 28 35 26 36 9
Sr 0.40 0.78 1.20 2.22 2.88 2.76 0.56
Co 0.15 0.30 0.47 0.47 0.35 0.53 0.13
Ni 0.10 0.16 0.16 0.20 0.18 0.19 0.04
Grain yield, t/ha/ 4 yrs* 6.1 9.3 8.6 6.1 18.0 18.5 3.2
Grain yield, t/ha/ 4 yrs** 1.9 4.8 5.5 3.9 10.0 10.6 2.6
*Sum of the 1999-2002. years
**Sum of the 2003-2006. years.
The NH4-acetate+EDTA soluble element contents change also as a function of the pH
(KCl). The content of Fe and Al diminished significantly with the increased pH (KCl)
values while the content of Ca, Mg and Mn enhanced. The limed soil was enriched also
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