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intensive in.'inageinent during the entire life of the tree. However, several 

 characteristics contribute to the selection of these trees as the best economic 

 choice: the trees reach full production earlier, the harvest period is longer, 

 and fruit can be harvested at a faster rate than those of other strains. 



OARl is an experimental rootstock that is being field tested with Mcintosh 

 in Massachusetts. It was ised in this study to determine its economic potential. 

 Marshall on OARl was selected by the model when harvest labor and cooling 

 capacity ^fere most constraining. Due to the experimental nature of this 

 rootstock Marshall/OAR 1 is not suggested for planting, but these results show 

 that a combination of strain and rootstock which results in later ripening is 

 desirable and can have high economic potential. Recent results suggest that 

 Mark also may delay fruit ripening and may be able to provide benefits similar 

 to those projected here for OARl. Unfortunately, it also is experimental, but 

 lias undergone moie thorough testing tlian OARl at this time. Clearly, a 

 rootstock that delays Mcintosh harvest has great value in a strain-rootstock 

 mix. 



Acres selected for replanting with Rogt^rs on "1.7A increased when harvest 

 labor and cooling capacity ivere more :ivailable. At the least constraining levels 

 of resources in the later planting years, Rogers/M.7A substituted for 

 Marshall/OARl. Thus, availability of labor and of cooling capacity affect 

 decision-making in this rejuvenation framework. 



Lastly, Marsiiall on M.7A was selected minimally. This study did not 

 recommi'iiil planting MarshaU/M.7A when Marshall/M.26 is an alternative. 

 However, >vhen M.26 is not an alternativf; because of inadequate soil moisture, 

 too shallow a soil, or a desire to avoid the more intensive management 

 required, Marshall/M. 7A would bo the obvious replacement. 



Every orchard functions under different conditions; yet, similarities among 

 orchards in growing and harvesting practices exist. This study examined a 

 hypothetical orchard. It did not use the costs of any specific orchard. 

 Alt'iough the results are specific to the rejuvenated 50 acres in the model, 

 suggestions for replant ing schemes can be rnade. To guarantee that all fruit be 

 harvested in all cases, harvest labor must be increased to 9 pickers for the 50 

 acres in year 11 and to 21 pickers by year 20. If this is not done, the entire 

 crop at full maturity cannot be picked. Also, cooling capacity must be 

 increased from the original ability to cool 9,000 busliels per 3-day picking 

 period, to 11,000 bushels per period by year 20. 



Table 2 is a suggested 10-year planting mi >c for a rejuventated 50-acre 

 orchard. It is based upon the research results and should be used as an aid for 

 grower decisions. Again, because MarsIiaU/OAR I is experimental, it is not 

 included in the suggest ed plant ing mix. For rejuvenatid acreages of differing 

 sizes, the percentage values can be applied. For exatrple, in year 3, 60% of a 

 rejuvenated acreage would be planted with Rogers/M.7A, and 40% planted with 

 Marshall/M.26. 



