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Study of N-phenyl-phthalamic acid effects on fruit setting and fruit quality of sweet, sour and duke cherries

Sweet and sour cherry are economically important fruits of the temperate zone. Sweet cherry (P. avium L.) is a diploid (AA, 2n = 2x = 16) and sour cherry (P. cerasus L.) is a tetraploid (AAFF, 2n = 4x = 32), supposed to result from natural hybridization between sweet cherry and ground cherry (P. fruticosa) (FFFF, 2n = 4x = 32). Duke cherry (P x gondouinii) is a tetraploid (AAAF, 2n = 4x = 32) and a natural hybrid between sour and sweet cherry and produces fruits which are intermediate between these two cherry types. In this study, influence of N-phenyl-phthalamic acid (Nevirol 60 WP) on fruit setting and fruit quality of three commercial cherry species (sweet cherry, sour cherry and duke cherry genotypes) was evaluated. The research results show that by using Nevirol 60 WPT we can improve the fruit setting. As a result of this process, the yield amount will increase, but fruit quality parameters (weight, length, width and diameter) were decreased. There is a significant difference between the reactions of different cultivars. It can be concluded Nevirol 60 WP has a great effect on the improvement of yield amount, especially by good nutrient supply. Also before using Nevirol 60 WP, we have to take into consideration that the increased yield needs a higher nutrient supply.