Principal Components and Classification Analysis of Manganese Content in Spring of Perennial Grassland Forage from Microecosystems of Banat Hills



The purpose of this research was to monitor the manganese (Mn) content of forage from perennial grassland microecosystems situated in the west part of Romania. Mineral and organic fertilization, since 2003, influenced the microecosystems conditions. It was used fermented sheep manure as organic fertilizer. Calamagrostis epigejos, Festuca rupicola and Trifolium repens represented mainly the Poaceae and Fabaceae families of grassland floristic matrix. It was determined the spring Mn content in the middle and at the end of May by ContrAA300 High-Resolution Continuum Source spectrometer of Analytik Jena. It was selected a number of 17 variables to compute the PC&CA model. The first three components described around 75% of total variance. The correlation coefficients for spring Mn contents of forage and mineral fertilization data were high, in 0.6 – 0.9 range. The correlation coefficients between fermented sheep manure data and spring Mn contents of forage were negatively.


fertilization; grassland; heavy metals; multivariate analysis.

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