Raspberry production with different NPK dosages in South Brazil

Reduced Nitrogen Fertilizer Rates Maintained Raspberry Growth in an Established Field

“…There were no N fertilizer rate by year interactions (p = 0.70) nor N fertilizer rate effects (p = 0.65) or year effects (p = 0.11) for leaf tissue N concentrations across the two-year study. The leaf tissue N concentrations in this study were similar to the values of "Autumn Bliss" red raspberries (2.48-2.74%) cultivated in South Brazil, "Meeker" red raspberries cultivated in Washington, USA (2.80-3.58%) and Oregon, USA (2.10-3.30%), and "Willamette" red raspberries (2.10-3.30%) cultivated in British Columbia, Canada [8,9,35,36].…”

“…The lack of response of leaf tissue N concentrations to N fertilizer rate was also observed in "Autumn Bliss" red raspberries grown in South Brazil, in "Willamette" red raspberries grown in Nova Scotia, Canada, in "Thornfree" blackberries grown in western Serbia, and in "Thornless Evergreen" blackberries grown in Oregon, USA [9,10,37,38]. In contrast, Heiberg (2002) and Spiers (2002) reported that increasing N fertilizer rate increased leaf tissue N concentrations of "Veten" red raspberries grown in Norway and "Navaho" blackberries grown in Mississippi, USA [11,39].…”

“…Fruits were in acceptable ranges for TSS, pH, TA, and TSS/TA [30]. Similarly, no differences in TSS content by the N fertilizer source and rate were observed in "Autumn Bliss" red raspberries grown in southern Brazil, "Meeker" red raspberries grown in western Serbia, and "Thornfree" blackberries grown in western Serbia [9,10,26]. However, Papp et al (1984) found that TSS of "Malling Exploit" floricane red raspberries decreased with high N fertilizer rates in Budapest, Hungary [31].…”

“…However, Papp et al (1984) found that TSS of "Malling Exploit" floricane red raspberries decreased with high N fertilizer rates in Budapest, Hungary [31]. In addition, Stojanov et al (2019) reported that pH and TA varied by fertilizer source and rate in "Meeker" red raspberries and Jeppsson (2000) found that the "Viking" black chokeberry TA differed by fertilizer rates, while Rizzi et al (2019) and Milošević et al (2018) found no differences in the pH and TA across different fertilization regimes in "Autumn Bliss" red raspberries and "Thornfree" blackberries, respectively [9,10,26,32]. Both Stojanov et al (2019) and Milošević et al (2018) observed that TSS/TA differed by fertilization regimes in "Meeker" red raspberries and "Thornfree" blackberries, respectively, whereas Rizzi et al (2019) reported the similar SS/TA across fertilizer treatments in "Autumn Bliss" red raspberries [9,10,26].…”

“…This indicates that the floricane red raspberry may prefer taking up fertilizer N instead of utilizing soil N and stored N when receiving high rates of N fertilizer [2]. Rizzi et al (2019) found that the "Autumn Bliss" primocane-fruiting red raspberry cultivated in south Brazil had a greater yield when they received either 200 or 300 kg ha −1 of N than plants that received 100 kg ha −1 of N. However, yields were similar between plants that received 200 and 300 kg ha −1 of N, which indicates fertilization beyond plant need may not benefit yields [9]. Field research carried out in western Serbia by Milošević et al (2018) found greater yields in the "Thornfree" trailing blackberry (Rubus L. subgenus Rubus, Watson) when plants received high rates of N [10].…”