AN ABNORMAL ORCHARD SOIL 



Table 4. — Leaf Scorch, McIntosh. 



Table 5. — Ash Analysis of Apple Leaves, September 18, 1937. 



Percent of Dry Matter 



dangerously low on any plot and potash on only one or two plots. Calcium was 

 rather low on the unlimed plots and not very high on the limed plots. Mag- 

 nesium was low on some plots and abundant on some. It is interesting to note 

 that the extremes — 0.13 and 0.36 percent — appeared in the check plots. 



Phosphorus was higher on the limed ends of all but two plots, the K plot and 

 one of the NPK plots. Differences between the limed and unlimed ends were 

 usually quite great. Potash was lower in trees on the limed ends of all plots; but 

 only the nitrogen plot, both with and without lime, showed real deficiency. 



Calcium and magnesium were about the same on the fertilized as on the check 

 plots. It is difficult to say what is the critical percentage of calcium. For mag- 

 nesium, 0.20 percent has come to be regarded as a possible marginal percentage, 

 although trees with less may show no definite symptoms of magnesium deficiency 

 and it sometimes shows on trees with a little higher amounts. Three limed plots 

 and five unlimed plots were below the 0.20 percent limit. 



