Abstract:
The current paper intends to
interpret from a technical point of view the
data and yield functions which resulted
from applying different fertilizer doses with
nitrogen and phosphorus. The analyzed
parameters (yield, yield increase, marginal
increase) represent basic elements with
determining role in establishing the doses
and approximating the economic efficiency
when applying fertilizers. The data comes
from a long time experience with chemical
fertilizers at Agricultural Research and
Development Station (A.R.D.S.) Secuieni,
Neamţ county, Romania, since 1975 and
examines the results obtained between
2010-2012. As a result of nitrogen and
phosphorus chemical fertilizers application
(compared to the unfertilized version N0P0),
were achieved yield increases of 5-56%,
representing 234-2342 kg/ha. The resulted
yield have been influenced by the fertilizer’s
type but also by the weather conditions in
the research period. The use of phosphorus
fertilizers in doses of P40-P160 brought
medium yield increases compared to the
unfertilized version P0 of 5-13%
representing 256-681 kg/ha, and those with
N40-N160 nitrogen brought medium increases
(compared to the unfertilized version N0) of
15 -35% representing 599-1584 kg/ha. The
production increases were directly
correlated with the doses used, establishing
highly significant correlations. The yield
increases achieved by applying 1 kg of
fertilizer active matter had medium values
of 4.25-8.82 kg wheat/kg active matter P2O5
at phosphorus fertilizers and 9.9-14.97 kg
wheat/kg active matter N at nitrogen
fertilizers. These increases were indirectly
correlated with the applied doses.
