
130 STORRS AGRICULTURAL EXPERIMENT STATION. 
In some of these experiments with mixed grasses the results 
were affected considerably by the varying proportions of clover 
in the crops from the different plots. In the yields from all 
the plots to which nitrogen was applied the proportion of 
clover was so small that the results were not affected materially ; 
but in the yields from plots (6a and 6b) upon which only 
mineral fertilizers were applied, the proportion of clover was 
large. Since clover is much richer in protein than the grasses, 
the percentage of protein in the crops from the mineral plots 
was proportionately much higher than the percentage in the 
crops from the nitrogen plots. In comparing the effects of the 
_ different fertilizers by the composition of the crops from the 
different plots this fact should be considered. In 1892, the 
third year of the experiment, the proportion of nitrogen com- 
pounds (protein) in the crop from the mineral plots was so 
large that it was thought best to make separate analyses of the 
entire crop and of the grasses. The restilts of analyses for that 
year show that the proportion of protein in the entire crop was 
T0.94 per cent., while in the grasses without the clover it was 
only 7.19 per cent. Accordingly the results from those plots 
TABLE 9.— Effects of nttrogenous fertilizers 




| 
| ( Sulphate of ammonia (Nitrogen, 75"Ibs.), 360 
ener nee 
Kinds and amounts of fertilizers per acre. No, of 
0. experiments, 
Ibs. 
0,00} Nothing, : é : / aig reve 4 
Dissolved boneblack, : ; j : 320 ° 
6a, 66 | Muriate of potash, : : : ; 160 t 3 
Dissolved boneblack, ‘ : : ‘ 320 
y] Muriate of potash, : : ; 160 3 
Nitrate of soda (Nitrogen, 25 lbs:), =. : 160 
Dissolved bonéblack, : , y 320 
8 Muriate of potash, : : : ‘ 160 é 
Nitrate of soda (Nitrogen, 50 lbs.), . E 320 
Dissolved boneblack, : : Se 320 
9 Muriate of potash, : : 5 : 160 3 
Nitrate of soda (Nitrogen, 75 lbs.), . . 480 
Dissolved boneblack, ; : ; 320 
Ce) Muriate of potash, : : ; 5 160 2 
Sulphate of ammonia (N itrogen, 25 Ibs.), . 120 
Dissolved boneblack, ; 3 ie 320 ) 
II Muriate of potash, ‘ , : : 160 2 
Sulphate of ammonia (Nitrogen, 50 lbs.), . 240 
Dissolved boneblack, : : ; : 320 
12 Muriate of potash, . : 160 2 
