Nitrogen level and time of mechanized summer shearing influence long-term performance of a high-density 'Redskin' peach orchard.
1989
Walsh C.S. | Allnutt F.J. | Miller A.N. | Thompson A.H.
'Redskin' peach (Prunus persica Batsch.) trees, planted at a high-density spacing (3 X 5 m), were fertilized annually with urea at rates of 45, 90, or 135 kg.ha-1. Trees were trained to a trapezoidal hedge by annual, mechanized, summer pruning. Within each fertilizer plot, subplots of five summer-pruning treatments were applied. Single pruning treatments were made at 120 days after full bloom (DAFB) and 150 DAFB. Paired pruning treatments were applied 30 + 60 DAFB, 60 + 120 DAFB, and 60 + 150 DAFB. Pruning at 120 DAFB alone, and in combination with pruning at 60 DAFB, decreased trunk cross-sectional area (TCA), fruit soluble solids content, and weight, while increasing the percentage of surface that was red. Pruning at 30 DAFB followed by a second pruning at 60 DAFB decreased leaf Ca concentration in comparison to pruning treatments applied later in the season. Increasing N fertilization also decreased leaf Ca. Year, N level, and pruning treatments gave a statistical interaction on mean fruit weight and yield.
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