136 FUNDAMENTALS OF FRUIT PRODUCTION 



Table 20. — Nitrogen Content of Developing Apples'" 



White A.strakan 



Pleissner Rambour 



An examination of the graphic presentation in Fig. 13 of the increase in the 

 absolute nitrogen content of apples and pears shows that the increase is rapid 



2& 



6 15 25 5 15 25 4- 14 24- 3 13 23 3 

 May June July Aug. Sept. Oct. 



Fig. 13. — Grama of nitrogen in one thou.sand fruits of the apple shown by broken lines 

 and of pears shown by continuous lines. (Plotted from data given by Pfeiffer.'^') 



at first, that in August there is little or no change and that in September in two of 

 the apple varieties, there is a second period of increase. These periods of increas- 



