DPPH scavenge capacity of grassland feed at the end of may, depending on fertilization, by PC&CA

Abstract

The main topic of this study was to use Principal Components & Classification Analysis (PC&CA) for statistic evaluations of DPPH scavenge capacity of perennial feed from hill grassland related to fertilization cases. It was harvested the plants at the end of May. StatSoft – STATISTICA, Version 10, performed PC&CA. DPPH values of perennial feed were included as supplementary variable in the PC&CA complex matrix. Active variables of the matrix were: soil humus, organic fertilization data with fermented sheep manure, mineral fertilization data based on nitrogen, the gravimetric distribution in grassland covering of Trifolium sp. (Tsp.%), Calamagrostis epigejos (Ce%), Festuca rupicola (Fr%), Inula britannica (Ib%), Filipendula vulgaris (Fv%). It was selected seven cases (with five replications): three fertilized organic, three mineral and one unfertilized. The correlation coefficient between Filipendula vulgaris (%) and DPPH scavenge capacity of perennial feed was 0.55. Calamagrostis epigejos (%) was influenced positively by the mineral nitrogen fertilization, correlation coefficient being 0.91, but this perennial plant did not increase the DPPH scavenge capacity of grassland feed (correlation coefficient was -0.47). Fermented sheep manure influenced positively the Trifolium sp. (%) in permanent grassland covering, correlation coefficient being 0.88, but it did not improve significantly the DPPH scavenge capacity of grassland feed in this period of the year (correlation coefficient was 0.01). PC&CA can represent a promising statistic tool for monitoring the DPPH scavenges capacity of perennial grassland forages as functional feed, depending on fertilization management.