MASS. EXPERIMENT STATION BULLETIN 444 



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Figure 1. Growth of Peach Trees as Influenced by Soil Treatment. 

 Trees set in 1922; photographed August 3, 1923. 

 A. Phosphorus only. B. Phosphorus plus lime. 



C. Nitrogen and phosphorus. D. Nitrogen and phosphorus plus lime. 



E. Nitrogen, phosphorus, and potash. F. Nitrogen, phosphorus, and potash plus lime. 



puzzling feature was that the burn seemed to be of the same type on every plot. 

 It was thought to look most like calcium deficiency burn. However, while 

 worse on the unlimed plots, it was severe on some of the limed plots and on the 

 gypsum plot which had large amounts of calcium sulfate for many years. Where- 

 ever potassium was applied scorch was more severe on the no-lime plots than on 

 the lime plots. It was worse in some years but the relative rank of the different 

 plots remained fairly consistent. There is a close but not perfect relation between 

 the amount of leaf scorch and trunk diameter. The scorch appeared in July 

 and on some trees destroyed 80 or 90 percent of the leaf surface. 



In September, 1937, composite samples of leaves from each plot were collected 

 and analyzed for ash, phosphoric acid, potash, calcium, and magnesium. The 

 results are shown in Table 5. It seems rather remarkable that there were few, 

 if any, cases of severe deficiencies on the unfertilized plots. Phosphorus was not 



