The Content of Polyphenols in Fruit of Highbush Blueberry (Vaccinium Corymbosum L.) Relating to Different Fertilizer Application

Abstract

Keywords: cultivars, blueberry, polyphenol, organic fertilizer, mineral fertilizer INTRO DUCTIO NT he fruits of blueberries have very positive effects on the human body. Characteristic of these fruits are their bioactive properties. T hey are an important source of polyphenolic compounds, flavonoids, especially anthocyanins and having high antioxidant activity. On the content of bioactive substances affect several factors, such as environmental conditions, degree of ripeness, variety, method of storage and processing. Polyphenols and phenol compounds represent one of the most numerous and most represented groups of plant metabolites and form part of the human diet . T hey are products of secondary metabolism of plants (Mandelová, 2005). Plant polyphenols are substances widespread in almost all plants, particularly in the leaves, flowers, seeds, fruits, and in pathology departments, as well as in products of plant origin (honey, propolis, wine). One group of polyphenols includes a wide and diverse range of compounds -from simple phenolic acids to high polymerized tannins. More than 8.000 phenolic compounds are known, but only a few hundred are identified in the edible parts of plants (Timoracká et al., 2008).

Effects of nitrogen, phosphorus and potassium formula fertilization on the yield and berry quality of blueberry

“…However, a scientific and reasonable fertilization method can effectively promote the growth of blueberry plants [9] and obtain blueberries with high quality and yield [10]. As blueberry is an oligotrophic species with shallow root system [11,12], it prefers ammonium N [13] and has low requirements for P, K, Ca and Mg [14], so there is often a phenomenon of overapplying N fertilizer and underapplying P and K fertilizer. At the same time, due to the poor absorption capacity of its roots, it is sensitive to fertilization [15].…”

The Effects of Fertilizers on Rabbiteye Blueberry (Vaccinium ashei Reade.) Root Distribution and Fruit Yield

“…This is not surprising given that blueberry is an oligotrophic plant. In comparison with other species, rabbiteye blueberry is particularly sensitive to chemical fertilizers [48]. The contents of N, P, calcium, manganese, and K in the leaves of Vaccinium uliginosum were previously found to be lower than those of other small berry tree species [49].…”