Effect of date of renovation on yield components of strawberries Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2v23vx921

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  • Two experiments were conducted from 1987 to 1990 to study the effect of date of renovation on strawberry yield and yield components. In the first experiment, 'Benton' plants were renovated from July 6, 1988 (1 week after harvest - WAH) to August 24, 1988 (8 WAH). In the second experiment 'Benton', 'Totem', and 'Redcrest' were studied. Treatments were date of renovation from July 12, 1989 (2 WAH) to August 16, 1989 (7 WAH), and a control (un-renovated). Date of renovation affected the number of runners per plant in fall, 1988 and 1989. The number of runners showed either a negative linear relationship ('Totem', 1989) or a quadratic relationship ('Benton', 1988 and 1989; 'Redcrest' 1989) with date of renovation — early-renovated plants (3 WAH or early) had the greatest number of runners. Thus, early-renovation may be more important in a matted row system than in a hill system. In the fall, 1988, early renovated 'Benton' plants (3 WAH or earlier) had a greater number of trusses and flowers per plant. The following summer the pattern was reversed; late-renovated plants (4 to 8 WAH) produced a higher yield. There was a positive linear relationship between date of renovation and the number of trusses and flowers per plant in 'Benton' in the summer of 1989. In the second experiment, 'Benton', 'Totem' and 'Redcrest' responded differently to date of renovation in the fall of 1989 as well as in the summer of 1990. There was very little flowering of 'Totem' in fall, 1989. In 'Benton', early-renovated plants (up to 6 WAH) did not differ significantly in number of trusses and flowers per plant compared to the control. However, early-renovated plants had a greater number of trusses and flowers per plant than late-renovated plants in the fall of 1989. In 'Redcrest', a negative linear relationship was present between date of renovation and the number of trusses and flowers per plant the fall of 1989. In summer, 1990, there was no significant difference between treatments and the control in number of trusses, number of flowers, leaf area (LA) per plant, plant fresh weight (PFW), and yield per plant in 'Totem'. Response of 'Redcrest' plants in summer, 1990 to date of renovation in 1989 was similar to 'Totem' expect that PFW differed between the treatments and control groups. Early-renovation (2 to 5 WAH) led to higher LA per plant. In 'Benton', plants renovated from 3 to 5 WAH had more trusses, flowers and LA per plant, and more PFW than late renovated plants (6 and 7 WAH). Un-renovated control plants tended to have the highest LA and PFW but did not differ significantly from early-renovated plants (2 to 5 WAH). The number of trusses and flowers on control plants was significantly lower than on early-renovated plants (2 to 5 WAH). Date of renovation had no significant effect on yield per plant in the summer of 1990 for all 3 cultivars individually. However, compared with the un-renovated control plants, the pooled yields of 'Benton', 'Totem', and 'Redcrest' showed a significant increase for early renovated plants (5 WAH or earlier). Compared with un-renovated plants, renovation significantly increased berry size in 'Totem', and delayed the date of harvest in 'Totem' and 'Redcrest' but not in 'Benton'.
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