## 4 Discussion  
As already stated, organic practice is thought to result in improved soil physicochemical properties, plant nutrition, and fruit organoleptic, physiological, and phytochemical properties, with an apparent benefit over conventional or integrated management. Based on the principal component analyses, though, the two cultivation practices employed, irrespective of the cultivar used, had many similar characteristics as reported by other researchers, too [1; 25; 26]. Additionally, the panelists found few differences between organically and integrated produced fruits in both cultivars, as has been reported by other researchers working with other fruits, too [7; 11]. On the other hand, the cultivar exhibited a great influence on the parameters assessed in the present research, similar to that reported in other studies [1; 2; 25; 27], and this was also confirmed by the results of the taste panel, where organically grown 'Bebecou' and integrated 'Diamantopoulou' fruits were the preferred choice by the panelists. Based on farmers' information, the integrated-grown trees presented higher yield than the organically grown ones by almost 25% (in 'Bebecou') and 23% (in 'Diamantopoulou'). Similar results have been reported by other researchers, too, working with different species, regarding the effects of cultivation practice on yield [9; 28; 29]. Nonetheless, yield is not the only thing a farmer should desire since quality substantially affects a product's acceptability and market placement. 'Bebecou' organic orchards presented significantly higher values in almost all physiological-biometric fruit parameters than the integrated ones, apart from the fruit firmness, which was higher under integrated management. Based on the fact that organically grown trees presented lower yields, it can be assumed that the larger fruits were the result of inter-fruit lower competition for assimilates. On the other hand, smaller fruits tend to present higher firmness in many cases [30; 31], probably due to the lower accumulation of water or to a denser mesocarp, as small fruits are characterized by reduced rates of mesocarp cell expansion [31; 32]. The differences observed in yield as well as in fruit physiological parameters in the 'Bebecou' cultivar can not be solely ascribed to the differences detected in tree nutrient status. Based on leaf analysis, there were few significant differences, while under both cultivation managements, the nutrient levels were within the adequacy range or, in some cases, higher than that [33; 34; 35; 36]. The only exception was the marginal Zn concentration in integrated-grown 'Bebecou' [35; 36]. However, the aforementioned differences were not able to justify the observed differences in yield and fruit quality components. Similarly, in the 'Diamantopoulou' cultivar, significant differences were not observed in the levels of most nutrients in the leaves, while in most cases, they were found in adequacy levels. The only exception was the low leaf K concentration, mainly in integrated-grown 'Diamantopoulou' [35; 36], which could be due to the higher fruit yield. Nonetheless, fruit weight, pulp width, and weight were higher under integrated practice, even though the yield was also higher, opposite to that found in 'Bebecou'. This discrepancy between the two cultivars could be due to the genotype effect, especially regarding the fruit size. 'Bebecou' is characterized by large fruits, while 'Diamantopoulou' bears small ones, the size and weight of which are less prone to competition for assimilates. On the other hand, integrated-grown 'Diamantopoulou' trees presented higher leaf Zn concentrations, which could partly justify the higher yield, as Zn serves as a co-factor for the production of endogenous auxin through tryptophan and stone fruits are species known to positively react to auxin treatment [22]. The opposite trend was observed in integrated-grown 'Bebecou' with the marginal Zn concentration and the lower yield.