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Nutrient status of Citrus aurantium and Buxus sempervirens in historic gardens of Arboretum Trsteno

The Arboretum of the Croatian Academy of Sciences and Arts with its historic gardens is considered to be one of the most valuable works of landscape architecture in Croatia with the collection of cultivated plants of particular significance. It should therefore be immediately revitalized, with special focus being paid to the plants from the Renaissance period. The aim of this study was to find appropriate revitalizing method of two plant species (Citrus aurantium and Buxus sempervirens) using nutrient status data. Data collection was undertaken in the field: a record of visual observations of intensity of chlorosis and average samples of soil and plant material were taken. Statistical analysis was used to estimate the correlation between intensity of chlorosis and soil reaction with biogenic elements and canonical discriminant analysis for each plant species. The results have shown that the nutrition status of Citrus aurantium is not optimal (pHH2O is in positive correlation with the intensity of chlorosis (r=0, 96, p<0, 0001) ; higher dry matter content increases the Ca in the leaves and the higher Ca content decreases N. The antagonistic relationship was confirmed by the negative strong correlation of K and Mg (r=-0, 90, p<0, 0011). The canonical discriminant analysis revealed a significant difference between visual evaluation according to the results of the chemical analysis of leaf). In the case of Buxus sempervirens the values of most elements are within optimal values (a medium strong correlation between dry matter and magnesium (r=0, 80, p<0, 0099) and a negative medium strong correlation between dry matter and zinc (r=-0, 75, p<0, 0188)). Based on the results, certain measures of revitalization according to the methods of the restoration of the historical gardens have been proposed as well as the proposed fertilization method for each plant based on nutrients status and plant nutrients requirements.

chlorosis ; fertilization design ; garden heritage ; Renaissance ; soil reaction

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