122 STORRS AGRICULTURAL EXPERIMENT STATION. 
than he could afford to apply if he intended to feed the crop 
to his own stock instead of selling it. A discussion of the 
effects of nitrogenous fertilizers upon the proportion of nitro- 
gen compounds (protein) in the crop will be found in the next 
division of the subject. 
Effects upon Yields of Hay of Mixed Grasses — During the 
years 1890, 1891, and 1892, three experiments were carried on 
with mixed grasses. Ten plots one-eighth of an acre each 
were used in each of these experiments, N itrogen was applied 
upon some of these plots in nitrate of soda and upon others in 
sulphate of ammonia. Similar effects upon yields of dry matter 
and protein followed the use of either of these materials jn these 
experiments. The effects of the different quantities of nitrogen 
when used with uniform quantities of mineral fertilizers are 
shown in the following table. The weights of the yields per 
acre represent the averages of the yields from plots upon 
which the same kinds and amounts of fertilizers were used. - 
TABLE 4. 
Comparison of yields of hay from plots upon which were used Sertil- 
tzers supplying different quantities of nitrogen, 

YIELD PER ACRE (11.1 % WATER),* 






Plot | Kinds and amounts 
No | of fertilizers per acre. 
Comparative scale, 2,600 Ibs. to the inch, | lbs. 
| Ibs. | 
0,00, Nothing, ; SP Py Re et 1881 
| § Dissolved boneblack, 320 
6a, 66 ( Muriate of potash, 160) abe eaiete eee 2064 
| § Mixed min. as plot 6a, 480) 
HeelO } Nitrogen, i : ST 3645 
Mixed min as plot 6a, | 480) 
8, er: Nitrogen, A 4727 
§ Mixed min. as plot 6a, | 480) 
9; i Nitrogen, : ou SS ee 

* While the water 
best to calculate the 
‘average. 
content of different crops of hay varies with the curing, it has been thought 
yields upon the basis of Y (11.1 %) water, which appears to be about the 
From this table it will be observed that the yields in- 
creased quite rapidly, in a general way, with the increase in the 
quantity of nitrogen applied. However, the difference be- 
tween the yield from the use of 75 pounds of nitrogen per acre, 
and the yield from the use of 50 pounds per acre, was not so 
ereat as the difference between the yield from the use of 50 
pounds per acre and th 
at from the use of 25 pounds per acre. 
