Comparison of two models of response to nitrogen doses in corn and coffee
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Abstract
recommendations is by fitting yield data for each crop
separately through mathematical models. This work was
carried out with the objective of comparing two response
equation models to nitrogen rates in two economically
important crops, corn and coffee, besides defining the
most appropriate criteria to select the model that offers an
adequate optimal fertilization rate. Thus, N doses from 0
to 200 kg ha-1 for corn (Zea mays) were studied along with
different types of crop rotation: fallow followed by corn;
fallow-corn inoculated with arbuscular mycorrhizal fungi
(AMF); jackbean-corn and jackbean-corn inoculated with
AMF, in experiments performed during 2003 and 2006.
In the case of coffee crop, N doses from 0 to 400 kg ha-1
were studied depending on plant age, within the first two
productive cycles of a Coffea canephora plantation, during
1996 and 2007. The rectilinear discontinuous model with
lineal equations and the curvilinear continuous model
with second degree equations were compared. Maximum
yield, optimum economic rate and partial productivity
factor were estimated by the equations obtained from each
model. In both crops studied, the rectilinear discontinuous
model offered lower fertilizer dose estimations than the one
obtained by the curvilinear model, so that together with the
partial productivity factor, they constitute effective methods
to estimate the amount of nutriments to be applied, avoiding
N overdoses.
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