24 GRASS GROWING FOR PROFIT 
Two Horse Hay Tedder, ready to operate. 
certain conditions to prevent plants from assimilating large 
amounts of potash in excess of their needs, thereby conserv- 
ing the potash supply within the soil. It does not appear 
unlikely, when the supply of potash is limited, that sodium 
salts may aid in some degree in performing some function of 
potassium.” 
The After-Effect of Sodium and Potassium Salts. 
(From Rhode Island Agricultural Experiment Station Bulletin, No. 106, 
May, 1905.) 
This experiment was a continuation of tests 
upon the same forty-eight plots upon which annual 
applications of sodium and potassium salts had been 
made since 1894. 
In 1902, 1903, and 1904 no further applications 
of sodium or potassium salts were made, but each 
