Effect of fruit load on the average fruit size and quality of "Fuji" apple trees on M. 9 dwarfing rootstock
1998
Fukuda, H. (National Inst. of Fruit Tree Science, Morioka (Japan). Apple Research Center) | Takishita, F.
Fruit load ability on 'Fuji' apple trees on M. 9 dwarfing rootstock, whose highest fruiting zone was about 2.8 m, was estimated based on the experimental data on fruit size and quality for 3 seasons; 1987, '88, and '90. Average fruit weight and refractometer reading (Brix value) tended to decrease linearly with the increase of the fruit load index determined by fruit/leaf dry weight ratio (F/L). On the contrary an exponential correlation was found between these parameters and the number of leaves per fruit. The regression equations between the number of leaves per fruit (X) and Brix value (Y1), average fruit weight (Y2) were as follows, (Y1) = 9.28X(0.0973) (r = 0.881) (Y2) = 132.21X(0.180) (r = 0.806) Brix value and average fruit weight were 13.6 degrees and 267 g in the case of 50 leaves per fruit, and 13.8 degrees and 276 g in the case of 60 leaves per fruit, respectively, based on the equations. Assuming that 60 leaves per fruit were required, trees with leaf area indices (LAIs) of 1.80 and 2.40 could yield 3 ton and 4 ton of apples per 10 a. When the number of leaves per fruit was set at 50, the LAIs for the same yields were 1.60 and 2.10, respectively
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