RESEARCH FOR

THE INFLUENCE OF CROPPING SYSTEMS DIFFERING
IN INTENSITY ON MINERAL NITROGEN MIGRATION
35
30
25
20
15
10
5
N min concentration
y = 51.796x -0.1881
r = 0.91
y = 0.1839x + 8.8371
r = 0.67
0
0 100 200 300 400
Yield GJ ha -1
0
0 50 100 150
N min kg ha -1
Figure 3. The dependence of Nmin conventration in drainage water (y) on field cfrop productivity (GJ ha-1 )
and amount of mineral nitrogen in soil.
conclusions
In 2006-2008 the agricultural research of different
intensity was carried out by ASU WRI in Endocalcari
Endohypogleyic Cambosol sandy loam soil (CMg-nw-can)
on the grounds of Juodkiškis village, which
allows making the following conclusions:
1. The organic cropping system showed the lowest
N min concentration and content in soil. The highest
concentration of this element was in the organicmineral
cropping system.
2. The minimum total yield of field plants was in
the mineral cropping system (428 GJ ha -1 ). In the
organic cropping system this indicator increased
by 8 but in the organic-mineral system - by 17
per cent. (respectively up to 462 and 502 GJ ha -1 ).
However, the mineral cropping system showed the
largest energy efficiency (ETK - 13).
164 ReseaRch foR RuRal Development 2012
35
30
25
20
15
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5
N min concentration
Saulius Gužys
3. The research of nitrogen concentration in
drainage water showed that the lowest content of
- N-NO was under mineral cropping conditions
3
(21.8 mg l-1 ). In the organic-mineral and organic
cropping systems nitrogen concentration
increased by 11 per cent (to 24.0-24.1 mg l-1 ).
Ammonia nitrogen concentration was the
lowest under organic cropping conditions. Nmin concentration is closely related to the plants yield,
with the increase of which it decreases, and to
mineral nitrogen content in soil, with the increase
of which N concentration increases.
min
4. Leaching of nitrogen compounds in all years of
research was determined by drainage run-off. The
organic farming system having the highest runoff
also demonstrated the maximum nitrogen leaching
by drainage.
references
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