USE OF PHOSPHORUS IN DIFFERENT FORMS 



279 



"Since 1894 no phosphate of any kind has been applied to these plots, but 

 the quantity of nitrate of soda and of potash-magnesia sulfate has been used in 

 one half greater quantities. 



"At first Doctor Goessman included no plot on which phosphate was not used 

 for comparison with the others. Later such a plot was added, but it was left 

 entirely unmanured until 1896. During 1896 and 1897 it has received the 

 nitrate of soda and potash-magnesia sulfate at the same rate as the other plots." 



The data (excepting from plot 3) are recorded in Table 48. 



TABLE 48. MASSACHUSETTS EXPERIMENTS WITH EQUAL MONEY VALUES OF 



DIFFERENT PHOSPHATES 

 Pounds per Plot (about 6600 Square Feet) 



Pounds per Acre 



