156 



STORRS AGRICULTURAL EXPERIMENT STATION. 



soda in addition, the quantity varying so as to furnish what 

 have been designated as the one-third, the two-third and the 

 full ration of nitrogen. The nitrate of soda used in the pots 

 numbered i to 12 inclusive contained 16.24 P^r cent, of nitrogen 

 and the quantities used were 2.05 grams for the one-third, 4.10 

 grams for the two-thirds, and 6.15 grams for the full ration; 

 while that in pots numbered 17 to 64 contained 16.47 P^^ cent, 

 of nitrogen, and the quantities used were 2.025 grams, 4.050 

 grams and 6.075 grams, respectively. The amounts of the 

 different fertilizing ingredients thus supplied were as follows: 



Table 76. 



In all the pots the mineral fertilizer was applied by mixing 

 it with the soil before the crops were planted. About eight 

 inches of soil from the top of that in each pot was removed, 

 the fertilizer was thoroughl}^ mixed with it and then it was re- 

 placed and tamped as before. In pots i to 12, which were 

 used for growing grass from sod, the nitrogenous fertilizer also 

 was added, to those pots which were to have nitrogen, at the 

 same time as the minerals. In the other pots in which nitro- 

 gen w-as used the nitrate of soda was applied in solution, iu 

 some pots ever}^ day and in others ever}^ other da}'. Either 25 

 or 50 cubic centimeters of a weak solution of the nitrate was^ 

 diluted to 500 cubic centimeters and then applied to the soil. 

 In this way a definite amount of nitrate of soda was added 

 every time the solution was used. The total amount thus 

 added during the growing .season was that given in the table 

 above. 



