22 



BULLETIN 958, U. S. DEPARTMENT OF AGRICULTURE. 



New Yorker there was a very decided grouping around the model 

 class, 22.2 per cent of the entire number of hills falling in this class 

 and 61.2 per cent in the 3, 4, and 5 tuber classes. In the Pearl there 

 was a much wider range of variability, with a considerable number 



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Fig. 9.— Diagram showing the number of tubers per hill produced in 500 hills of Bural New Yorker (average, 

 4.5) and 500 hills of Pearl (average, 6.9) . 



of the individuals m the intermediate classes. The average hill pro- 

 duction of this variety was 2.4 tubers greater than that of the Rural 

 New Yorker, 



The curves for weight of tubers per hill (fig. 10) show that there 

 was much greater uniformity in production in the Rural New Yorker. 





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Fig . 10.— Diagram showing the weight of tubers per hill produced in 500 hills of Rural New Yorker (average, 

 860.7 grams) and 500 hills of Pearl (average, 944 grams) . 



The Pearl, however, produced the larger average yield, the weight 

 per hill exceeding that of the Rural New Yorker by 83.3 grams. 



A further comparison of the behavior of different varieties of pota- 

 toes under varying treatment respecting irrigation is shown in Table 



