Comparative research of some pepper genotypes (Capsicum annuum l.) in organic and convetional production

Bicikliski, Olivera (2018) Comparative research of some pepper genotypes (Capsicum annuum l.) in organic and convetional production. PhD thesis, Goce Delcev University, Stip.

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This doctoral thesis presents the results from three-year comparative research of biological, morphological, productive and quality characteristics on peppers (Capsicum annuum L.) grown in an organic and conventional manner. As research material, six pepper genotypes: Strumicka Kapija, Strumicka Vezena, Piran, Zupska Rana, Duga Bela and Kurtovska Kapija were used. The research in this dissertation has been comprehended through field research by setting trial field, as well as laboratory research. The field studies have been set on the trial field of the location „Kamnik“ near Skopje, in the production unit of the „Kamnik Bio Organic“. The experimental plot has been set according to the random block system method in three replications in the organic and three replications in the conventional part, within total area of 129,85 m². In total, 15 characteristics of pepper have been analyzed and compared, as: genotype earliness and total vegetation period, plant height and number of branches per plant, fruit length, fruit width, fruit weight, weight of fruit without stalk and seed, fruit index, pericarp thickness and fruit flesh, yield of the genotypes, antioxidative potential, capsaicin content and vitamin C content. The obtained results have been statistically processed with a univariate analysis of the ANOVA variance for determining and comparing the effect of the influence of the researched genotypes and the impact of production system on the researched characteristics of the statistical software Statistical Package for the Social Sciences (IBM SPSS Statistics Software 19.0). From the results, it was found that the influence of the genotype on the established differences in the studied characteristics of pepper genotypes grown in the organic and conventional system is greater as compared to the impact of the production system. From the analysis of the biological characteristics, it was identified that the studied pepper genotypes in both production systems did not show significant differences in their earliness and the total vegetation period. The plants grown under the organic system are shorter for 0,71 cm, while the plants in the conventional system have 0,116 larger number of branches per plant. Comparative analysis revealed that the gentypes of pepper fruits in the organic system have a smaller length of 0,109 cm, as well as 0,195 cm a higher width as compared to the fruits from the conventional pepper genotypes. The genotypes in organic production have 1,868 g higher total weight and also 1,951 g higher weight of the fruit without stalk and seed, while the index of the fruits in the conventional production is 0,291 bigger as comapared to the genotypes from the organic production. The fruits in conventional system have 0,054 cm thicker pericarp compared to organic system, as well as 0,694% smaller average value of the fruit flesh. The total average yield of the organic pepper genotypes is 2,008 t/ha higher than the total yield of the conventional system. In terms of quality characteristics, the pepper genotypes in the organic production system have a 0,061 higher antioxidant potential, 0,798 mg/g higher average capsaicin content and 8,414 mg/g higher average vitamin C content as compared to the pepper genotypes grown in the conventional production system. Key words: biological characteristics, morphological characteristics, yield, quality characteristics

Item Type: Thesis (PhD)
Subjects: Agricultural Sciences > Other agricultural sciences
Divisions: Faculty of Agriculture
Depositing User: Sladzana Mitrovska
Date Deposited: 28 Nov 2018 11:07
Last Modified: 28 Nov 2018 11:07

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