Abstract:
A three-year field experiment was conducted under c
onditions of Luvic Chernozem
soil. Diversified nitrogen fertilization with 0, 60
, 120, and 180 kg N ha
-1
, and microbial
preparations improving soil properties were applied
to potatoes,
cv.
‘Satina’, cultivation.
N–NO
3
concentration in the soil profile (0–0.9 m) in aut
umn after potato harvesting
fluctuated from 28 kg N ha
-1
in the N
0
treatment to 70 kg N ha
-1
in the N
180
treatment,
whereas N–NH
4
content varied from 22 to 48 kg N ha
-1
, respectively. The level of nitrogen
fertilization also had a significant effect on the
change in soil N–NO
3
content during the
autumn-winter period. The decrease
in N–NO
3
content in the N
0
treatments was 7%
compared to 24%
in the N
180
treatments. Application of microbial preparations
to potato
cultivation caused an increase in N
min
content in soil after crop harvesting. However, af
ter
the autumn-winter period, a lower amount of N–NO
3
, compared to the control treatment,
was found in the treatments where microbial prepara
tions had been used.
Keywords:
Ammonium nitrogen, Nitrate nitrogen, Loss of N–NO
3
,
Solanum tuberosum
.
