Figures (1)  Tables (3)

    • Figure 1. 

      Interaction of fertilizer × year in yield of cultivar 'Amethyst'.

    • Fertilizer level (kg N/ha) Boyne Nova Encore Amethyst
      Fruit size (g/fruit) Brix Fruit size (g/fruit) Brix Fruit size (g/fruit) Brix Fruit size (g/fruit) Brix
      0 1.60 ± 0.44 10.59 ± 0.65 1.75 ± 0.35 10.72 ± 0.78 1.57 ± 0.36 10.95 ± 1.42 1.44 ± 0.22 10.53 ± 0.56
      17 1.53 ± 0.47 11.06 ± 1.15 1.72 ± 0.40 10.73 ± 0.94 1.68 ± 0.56 10.60 ± 1.23 1.55 ± 0.20 10.92 ± 0.61
      34 1.62 ± 0.42 10.78 ± 0.76 1.76 ± 0.33 10.87 ± 0.50 1.61 ± 0.40 10.70 ± 0.99 1.49 ± 0.30 10.75 ± 0.99
      Year
      2020 1.84 ± 0.30a 10.07 ± 0.30b 2.06 ± 0.12a 10.26 ± 0.34b 1.96 ± 0.34a 9.98 ± 0.54b 1.70 ± 0.10a 10.29 ± 0.62b
      2021 1.33 ± 0.44b 11.55 ± 0.45a 1.43 ± 0.09b 11.29 ± 0.61a 1.28 ± 0.10b 11.52 ± 1.10a 1.28 ± 0.09b 11.18 ± 0.52a
      Significance
      Fertilizer level NS NS NS NS NS NS NS NS
      Year < 0.001 < 0.001 < 0.001 0.0025 0.0003 0.0069 < 0.001 0.0041
      Fertilizer level × year NS NS NS NS NS NS NS NS
      Means followed by the same letter within a column of each cultivar are not significantly different from each other at p ≤ 0.05. NS means no significant differences at p ≤ 0.05.

      Table 1. 

      The effect of fertilization on fruit size and Brix of four floricane-fruiting raspberry cultivars in Fargo, ND, USA.

    • Fertilizer level (kg N/ha) Boyne Nova Encore Amethyst
      Yield (kg/ha) Bud damage index Yield (kg/ha) Bud damage index Yield (kg/ha) Bud damage index Yield (kg/ha) Bud damage index
      0 1030 ± 439 0 895 ± 419 0.40 ± 0.63 340 ± 204 0.58 ± 0.49 1232 ± 736 1.25 ± 0.61
      18 728 ± 343 0 854 ± 530 0.50 ± 0.55 644 ± 515 0.42 ± 0.49 1084 ± 461 1.08 ± 0.38
      36 1032 ± 409 0 903 ± 498 0.33 ± 0.41 498 ± 331 0.58 ± 0.58 1169 ± 435 0.83 ± 0.41
      Year
      2020 847 ± 447b 0 502 ± 260b 0.77 ± 0.49a 585 ± 459 0.94 ± 0.30a 696 ± 226b 1.33 ± 0.50a
      2021 1013 ± 348a 0 1266 ± 213a 0.06 ± 0.17b 406 ± 256 0.11 ± 0.22b 1626 ± 245a 0.78 ± 0.26b
      Significance
      Fertilizer level NS NS NS NS NS NS NS NS
      Year < 0.001 NS < 0.001 0.0025 NS < 0.001 < 0.001 0.0155
      Fertilizer level × year NS NS NS NS NS NS 0.0275 NS
      Means followed by the same letter within a column of each cultivar are not significantly different from each other at p ≤ 0.05. NS means no significant differences at p ≤ 0.05.

      Table 2. 

      The effect of fertilization on yield and winter bud damage of four floricane-fruiting raspberry cultivars in Fargo, ND, USA.

    • Fertilizer level (kg N/ha) Boyne Nova Encore Amethyst
      Cane height (cm) Cane number Cane height (cm) Cane number Cane height (cm) Cane number Cane height (cm) Cane number
      0 76.0 ± 8.4 19.1 ± 5.6 84.2 ± 11.6 19.7 ± 6.1 77.2 ± 5.5 17.2 ± 6.7 128.7 ± 8.1 13.8 ± 4.6
      17 79.2 ± 9.7 20.7 ± 3.8 94.5 ± 10.2 23.2 ± 6.1 87.7 ± 12.4 19.7 ± 6.3 125.7 ± 5.3 13.8 ± 2.6
      34 83.0 ± 16.5 22.0 ± 7.3 95.2 ± 11.6 23.2 ± 9.4 79.8 ± 19.7 17.7 ± 6.7 128.0 ± 7.3 14.3 ± 3.8
      Year
      2020 85.7 ± 9.8a 24.8 ± 3.3a 96.4 ± 10.7 27.8 ± 5.0 91.3 ± 8.8a 22.2 ± 5.1a 124.1 ± 2.2b 16.0 ± 3.7a
      2021 73.1 ± 10.3b 16.4 ± 3.8b 86.1 ± 10.7 16.2 ± 2.8 71.8 ± 15.0b 14.1 ± 3.4b 130.8 ± 8.1a 12.0 ± 2.1b
      Significance
      Fertilizer level NS NS NS NS NS NS NS NS
      Year 0.0076 0.0002 NS NS 0.0004 0.0002 0.0546 0.0171
      Fertilizer level × year NS NS NS NS NS NS NS NS
      Means followed by the same letter within a column of each cultivar are not significantly different from each other at p ≤ 0.05. NS means no significant differences at p ≤ 0.05.

      Table 3. 

      The effect of fertilization on cane height and cane number of four floricane-fruiting raspberry cultivars in Fargo, ND, USA.