Abstract:
The investigations
conducted during 1995-2009 at the Podu-
Iloaiei Agricultural Research Station have
studied the influence of different organomineral
fertilization rates on wheat yield
and soil agrochemical characteristics.
Within the experiment, the following
rotation schemes have been followed: 2-
year rotation (wheat-maize) and 5-year
rotation (bean – wheat – sunflower – wheat
- maize). The organic fertilizers, applied
together with mineral ones (N50P50+60 t
manure/ha), have improved soil chemical
characteristics and determined mean yield
increases in wheat of 122% (1918 kg/ha), as
compared with the unfertilized control. In
the intensive rotations with cereals, with
high annual consumption of nutrients,
maintaining a good soil supply with organic
carbon and mineral elements was done only
by the organo-mineral fertilization (N50P50
or N100P100 + 40 t manure/ha). In 5-year crop
rotation, the content of organic carbon from
soil has diminished by approximate 2.1
g/kg/year in unfertilized control and by 0.90
g/kg/year at the rate of N120P80.
