Published in Scientific Papers. Series "Management, Economic Engineering in Agriculture and rural development", Vol. 20 ISSUE 2
Written by Maria BĂLA, Florin SALA
The study aimed to evaluate the quality of flowers in daffodils (Narcissus pseudonarcissus L.) in relation to physiological indices and parameters and floral indices. The biological material was represented by five varieties of daffodils: 'Carlton', 'Ice Follies', 'St. Patrick', 'Dick Wilden' and 'Salome'. A series of physiological indices and parameters, and floral indices were evaluated that described the status of plants (plant height - PH, number of leaves - LN, length of leaves - LL), vegetation period (VP), flowering period (FP), and flowers size (FS). The flowering period (FP) expressed in days, recorded the values: FP = 13 days for 'Carlton', FP = 18 days for 'Ice Follies', FP = 9 days for 'St. Patrick', FP = 10 days for 'Dick Wilden', and respectively FP = 11 days for 'Salome'. Correlation analysis revealed very high, positive, correlations between FS and LN (r = 0.968), and between plant height (PH) and leaf length (LL) (r = 0.915). The variation of FS according to LN was described by a polynomial equation of degree 2, under conditions of R2 = 0.938, p << 0.01. A 3D model of FS variation with respect to LN and FP was obtained, and a graphical representation in the form of isoquant, expressed a possible combination of LN and FP for optimum of FS. Principal Component Analysis (PCA) led to the distribution of the studied varieties in relation to the main quality parameters considered (VP, FP and FS). PC1 explained 43.701% of variance, and PC2 explained 39.003% of variance. Cluster analysis led to the grouping of daffodils varieties based on affinity with respect to flower quality indices (FP and FS) under statistical safety conditions, Coph.corr. = 0.924.
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