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use of additives is not desirable for apples in chemical thinning sprays. 

 Additives greatly increase the absorption of NAA and NAAmide, but do not neces- 

 sarily cause more thinning than the same concentration of NAA or NAAmide alone. 

 Also, additives may markedly increase the foliage injury from a given concentra- 

 tion of NAA or NAAmide. 



F. W. Southwick 



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