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APPLICATION EFFECT OF SELECTED PLANT BIOSTIMULANTS ON THE QUANTITATIVE AND QUALITATIVE PARAMETERS OF SWEET PEPPER (CAPSICUM ANNUUM L.) IN THE ORGANIC FARMING SYSTEM
Abstract
The aim of this study was to evaluate the effects of plant biostimulants Agriful and Trichomil on selected quantitative and qualitative parameters of pepper fruits. To the small plot experiment were included 2 hybrid varieties: Kapirex F1 and Esperansa F1. The experiment was carried out in the unheated plastic tunnel in the Botanical Garden of the SUA in Nitra (Slovakia) in 2016 and 2017. We observed three variants: control (without application of biostimulants); Agriful variant (5 times application of Agriful at 50 ml for 10 l-1 of water) and Agriful + Trichomil variant (5 times Agriful at 50 ml for 10 l + 2x Trichomil at 50 ml for 10 l). Fruit harvest was gradual in full botanical maturity. Differences in fresh pepper fruit weight, total yield and total carotenoids (spectrophotometrically) or vitamin C (HPLC method) were recorded. The fruits were also classified according to the commercial quality standards for fresh sweet pepper into quality classes (Extra class, 1st and 2nd quality classes and substandard). Our results showed that genotype and growing season had a significant effect on the observed parameters: fruit length and weight. Application of biostimulants had a positive effect on the yield of fruits and fruit quality. Especially after Agriful application, we recorded more than 20 % increase in total yield while only a minimum of fruits were in substandard class. However, vitamin C or total carotenoids content were not affected by the variant.
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