Joint International Conference on Long-term Experiments ...

According to our results, the effect of phosphorus fertilization on the Mg and Mn
content of the samples was not significant in Karcag.
In the Iregszemcse research site, the effect of phosphorus fertilizer on the Mg content of
the samples was only significant in 2002, while on the Mn content of samples was
significant in 2001, 2002 and 2004. In these cases the phosphorus doses increased the
concentration of these elements.
We found that in Nagyhörcsök the application of 100 or 120 kg/ha P2O5 active
substance– irrespectively of the forecrop – increased the Mg and Mn content of the
wheat grain samples in almost every crop year. (Table 2).
Table 2: The effect of phosphorus fertilization on the Magnesium and Manganese
content of winter wheat samples from Nagyhörcsök
Mg content (mg/kg) Mn content (mg/kg)
2001 2004 2005 2001 2004 2005
control 775,8±25,8 1013,3±29,8 959,0±29,8 24,8±1,4 29,2±2,0 10,7±0,3
100 kg/ha
933,3±24,5 1219,5±19,5 1086,3±48,7 38,3±1,5 45,1±1,0 12,5±0,1
P2O 5
p value 0,000 0,000 0,011 0,000 0,000 0,000
The effect of K fertilization on the mineral content of winter wheat samples
In 2004 in Karcag, the application of 200 kg/ha K fertilizer significantly increased the
Ca, Mg and Mn content of wheat grain samples after corn forecrop, while in the same
year this effect was not experienced after winter wheat forecrop.
In the Iregszemcse research site, the effect of K on the nutrient content of the samples
was statistically proved in one crop rotation in one year (2004): the average manganese
content of the control wheat samples was 12,2±0,1 mg/kg, and the application of 100
kg/ha K2O increased this value to 12,9±0,1 mg/kg. The effect was proved at P=1%
significance level.
Contrary to the results from the Karcag and Iregszemcse research sites, (Figure 2)
the application of K fertilizer decreased the Ca and Mg content of the wheat grain
samples in each case in Nagyhörcsök, the results are statistically proved. The
application of K fertilizer decreased the Ca content of wheat grain samples from
525,5±32,6 mg/kg to 442,3±39,8 mg/kg in 2001, and from 682,3±47,4 mg/kg to
321,3±12,8 mg/kg in 2005. In Nagyhörcsök, the changes in the Mg content proved to be
significant only in 2001, when the Mg content of the control wheat samples decreased
from 1022,8±20,2 mg/kg to 890,0±32,7 mg/kg.
259