The objective of this study was to investigate the effects of biochar (B) at different application doses (0, 10 and 20 t ha-1) on the content of macro- and micronutrients in soil (silt loamy Haplic Luvisol at a field site of Dolná Malanta, Slovakia) as well as in the organs of corn. Application of 20 t ha-1 of biochar had significant effects by increasing the soil pH, total content of P, Ca and available K. The content of available Mn, Ni and Zn in the soil significantly increased in B20 treatment by 45, 17 and 32%, respectively, as compared to B0. The total content of Cu in the soil was significantly decreased by 9 % in B20 compared to B0. In comparison to B0, the statistically significantly lower Ca content was found in corn seeds grown on the plots where biochar in both doses was applied. Biochar applied to the soil did not change the content of other macro- and micronutrients in the corn organs. Negative correlations between P in seeds of corn and total (r=0.543, P≤0.05) and available (r=0.564, P≤0.05) content of P were observed. Higher total content of K in the soil resulted in higher content of K in leaves (r=0.561, P≤0.05) and corn seeds (r=0.905, P≤0.001). Higher total content of Mn in the soil increased the content of Mn in stalks (r=0.830, P≤0.001) and in seeds of corn (r=0.874, P≤0.001). There was a positive correlation (r=0.756, P≤0.001)  observed between the total content of Zn in the soil and Zn in corn roots and, conversely, a  negative correlation was determined between available Zn in the soil and Zn in corn roots  (r=-0.506, P≤0.05).  

24.2.2019