Naslov
Polyphenol content in apple fruits as affected by crop load and rate of applied nitrogen

Autori
Unuk, Tatjana ; Tojnko, Stanislav ; Čmelik, Zlatko

Izvornik
Acta Horticulturae (0567-7572) 721 (2006); 173-176

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
apples; crop load; polyphenol; nitrogen fertilization

Sažetak
The influence of crop load and N rates on polyphenol content in fruits of 'Fuji', 'Gala' and 'Golden Delicious' apple was investigated in Slovenia. Trees were grafted on M9 rootstock, grown at a spacing of 2.8x0.7 m and trained to slender spindle. Nitrogen was ground-applied at three rates (60, 90 and 120 kg N ha-1). In mid-June, different crop loads were established by adjusting fruit number to three levels for 'Fuji' (5.0, 3.5 and 1.5 fruits cm-2 TCSA) and 'Gala' (9.0, 6.0 and 3.0 fruits cm-2 TCSA), and two levels for 'Golden Delicious' (4.0 and 1.5 fruits cm-2 TCSA). According to fruit analyses results (cortex plus skin), total polyphenols content in 'Golden Delicious' were between 147 and 197 mg kg-1, in 'Gala' between 132 and 205 mg kg-1, and 144-178 mg kg-1 of fresh fruit weight in 'Fuji'. The influence of applied N fertilizer or crop load on fruit polyphenol content was not consistent, and no significant differences were found. Results indicate that crop load or N fertilizer do not represent major regulatory factors in polyphenol formation in apples.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA