> -8- 



apples were resistant to breakdown regardless of the concentrations 

 of other elements. 



100 



o 

 o 



< 



UJ 



q: 



< 

 z 



UJ 



80 



UJ 

 O 



tr. 



UJ 

 Q. 



r • -.401 



• • • » staff i\*»|^.»«* • • 



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100 130 160 190 " 250 



ppm CALCIUM, OUTER CORTEX TISSUE 



Figure 1. Scattergram showing percent breakdown after air storage 

 in relation to the Ca concentration in fruit at harvest 

 for each of the 172 commercial samples surveyed, 1979- 

 1982. 



Our study reaffirms the importance of establishing adequate Ca 

 concentrations in Mcintosh apples if they are to be stored for long 

 intervals. There are 2 feasible approaches to this: foliar and post- 

 harvest applications of Ca. Application of a total of approximately 

 75 lbs. of CaCl2 per acre during the growing season can raise fruit 

 Ca concentrations by about 50 ppm, and a postharvest dip in 4% CaCl2 

 can increase it by about 35 ppm. It is evident that many commercial 

 samples did not contain adequate Ca concentrations and that they would 

 have benefited from the above treatments. 



The 

 are rest 

 and rot. 

 after st 

 inf luenc 

 ly soft 

 and soft 

 storage 

 harveste 

 temperat 

 exhibit 

 position 

 manageme 



effe 

 ricte 

 Pro 

 orage 

 ed by 

 fruit 

 ening 

 manag 

 d ove 

 ure o 

 infer 

 s doe 

 nt. 



cts of m 

 d to the 

 bably th 

 is the 

 variati 

 is unac 

 of the 

 ement . 

 rmature, 

 r at the 

 ior qual 

 s not re 



ineral nutrition 



occurrence of d 



e most significa 



firmness of the 



ons of any of th 



ceptable, whethe 



fruit is control 



Regardless of th 



cooled improper 



wrong atmospher 



ity after storag 



duce the need fo 



on apple quality recorded here 

 isorders (breakdown and scald) 

 nt attribute of Mcintosh quality 

 fruit, and fruit firmness was not 

 e minerals surveyed. An excessive 

 r or not it develops disorders, 

 led primarily by harvest and 

 eir mineral concentrations, apples 

 ly, or stored at too high a 

 ic composition are likely to 

 e. The best of mineral com- 

 r careful harvest and storage 



