## 3 Results and Discussion  
### Sensory Test  
Figure 2 shows the biplot of sensory data of CATPCA. The samples originated from two consecutive harvest years. In case of 'Zeno Plus' and 'Snow White', the two sets of oil samples from the two years are overlapping; 'Korona' and 'Morgana' samples show a larger difference, while the samples are located close to each other. Attribute vectors show that taste persistency and overall flavour values followed similar patterns. Poppy odour and poppy flavour also point to the same direction. 'Zeno Plus' samples showed the highest intensities in poppy odour and poppy flavour, while 'Albakomp', 'Orel' and 'Snow White' had moderate values here. Both samples of the high morphine containing the 'Morgana' variety had the highest intensity in throat catching attribute while 'Zeno Plus' was advantageous also from this respect. Differences in flavour profiles of spring and winter poppy varieties have been shown earlier [15], but the present study demonstrates it also between high-alkaloid (industrial) and low-alkaloid (culinary) cultivars.  
Figure 3 shows the sensory data matrix CATPCA biplot of poppy seed flour samples. From the distribution of the samples, it is clearly visible that the varieties with white seeds ('Albakomp', 'Orel' and 'Snow White'), are located on the left-hand side of the plane showing a low overall flavour intensity. The two harvest years of 'Zeno Plus' are relatively distant from each other, while in the case of 'Korona' and 'Morgana', the samples are quite close to each other. The distance between the two years of 'Snow White' is also considerable. Generally, poppy odour and poppy flavour are more typical to the blue-seed varieties. Nevertheless, the colour might have an indirect influence on the panel members which was unavoidable in this study. Attributes of tactile perception and granularity are overlapping each other, as these two attributes were showing similar data patterns.  
Figure 3: Sensory data biplot of poppy seed flour samples 1 ‘Albakomp’ 2021; 2 ‘Orel’ 2021; 3 ‘Zeno Plus’ 2021; 4 ‘Zeno Plus’ 2022; 5 ‘Korona’ 2021; 6 ‘Korona’ 2022; 7 ‘Morgana’ 2021; 8 ‘Morgana’ 2022; 9 ‘Snow White’ 2021; 10 ‘Snow White’ 2022.  
Figure 2: Sensory data biplot of poppy seed oil samples 1 ‘Albakomp’ 2021; 2 ‘Orel’ 2021; 3 ‘Zeno Plus’ 2021; 4 ‘Zeno Plus’ 2022; 5 ‘Korona’ 2021; 6 ‘Korona’ 2022; 7 ‘Morgana’ 2021; 8 ‘Morgana’ 2022; 9 ‘Snow White’ 2021; 10 ‘Snow White’ 2022.  
We also performed a Hierarchical Cluster Analysis to identify the similarities and differences between the sensory data matrices. Figure 4 shows the dendrogram of the oil samples.  
From the cluster combination protocol, we can understand that for most varieties, the harvest year caused no relevant differences in the samples. 'Zeno Plus', 'Morgana' and 'Snow White' samples are assigned to the same clusters, independent from the harvest year. Only in the case of 'Korona', there was a larger difference between the two years. It suggests that this variety may be more sensitive to the weather conditions and/or to the storage time. The effect of the environmental conditions is well known to the yield and alkaloid content of poppy [4]; however, according to our knowledge, the effect of the year on sensory characteristics has not been demonstrated in this species until now.  
The cluster analysis of the flows (Figure 5) shows two main clusters, where the major clustering factor is the colour of the seed. White-seeded varieties ('Albakomp', 'Orel' and 'Snow White' samples) are assigned to the first cluster, while the blue-seeded samples belong to the second. If we formulate three clusters, then 'Albakomp' 2021 and 'Snow White' 2021 are in the first cluster, 'Orel' 2021 and 'Snow White' 2022 are in the second, and the blue varieties are in the third one. When considering the fourth cluster, there is a smaller division among the blue varieties. Interestingly, flour samples from different years of the same variety are not so close to each other than in the case of the oils.