1908.] 



IMPROVEMENT OF THE POTATO. 



433 



physical condition for growing potatoes. It was known, however, 

 that it was not nearly so deficient in phosphorus as in potassium. 

 As is seen, the quality grew markedly better where the potassium 

 chlorid was supplied at the rate of 300 Ib. per acre, but apparently 

 very little difference was made by doubling the applications of 

 phosphorus. 



TABLE n. INFLUENCE OF FERTILIZERS ON QUALITY 



The explanation of this fact is apparent, I think, in the next 

 table, which shows the number of tubers produced of different 

 classes of 30 grams each. There was simply a more nearly normal 

 development of the tubers in the last three plots, due to the avail- 

 ability of more potassium. 



