The variation of some vegetation indices of maize under the influance of mineral fertilization

Abstract

The present research studied the variation of foliar area and chlorophyll in maize under the influence of
mineral fertilization.
The fertilizers applied were nitrogen, in doses that varied from 0 to 200 kg a.s. ha-1, and the PK complex indoses between 0 and 150 kg a.s. ha-1. The vegetation indices were studied in the leaf opposite the ear, and the determinations were made during the silking stage. The foliar area varied between 513.88±16.47 cm2 in the
control variant and 724.32±13.61 cm2 in the variant with P150K150N200. Chlorophyll values ranged from
30.74±0.89 to 55.93±0.73 SPAD units in the same variants. The experimental results present high degree of
statistical certainty (p< 0.01; F >> F crit, for Alfa = 0.001). The interdependence identified between the
vegetation indices and the fertilizer doses was revealed by statistical-mathematical analysis (correlations and
regressions) as well as by graphical representation.