
158 STORRS AGRICULTURAL EXPERIMENT STATION. 
TABLE 24.— Yields of dry matter and protein in grasses and corn by the 
use of different quantities of nitrogen, compared with yields in cow 
peas and soy beans by the use of the same quantities. In 
these calculations yield with mineral fertilizer only ts 
taken at roo. 
Cow PEAS, Soy BEANS, 


Peaks. WORN CaS ee GREEN PLANT. SEEDS. 
Fertilizers. s 
Dry ; Dry : Dry : ry ; 
; otein. 
matter: Protein. iidtker: Protein. ace Protein ates Protein 





Per ct.|Per ct.|Per ct.|Per ct.|Per ct.|Per ct.|Per ct.|/Per ct. 
Minerals only, I0Q |» 100.| 100 | I007)s8100 4) )100memnoe 100 
Minerals + nitrogen 25 lbs., 137 127 135 143 104 100 | 102 105. 
Minerals + nitrogen 50 lbs., | 177 188 165 181 100 IOI 115 120 
Minerals + nitrogen 75 lbs.,| 188 | 222! 168] 200 98 | 100°] 117 |)uae 



PRACTICAL DEDUCTIONS. 
One of the clearest deductions that may be made from the 
results of these experiments is that, in the use of nitrogenous 
fertilizers, great care should be taken to adapt the fertilizers 
used to the crop grown. | 
The true grasses, like timothy and red top, make most of 
their growth during a short period of time in the early part of 
the season. For this reason the best results in yield and in 
feeding value depend upon the amount of nitrogen that is im- 
mediately available for the growing plant; and it is important 
that whatever nitrogen is supplied in fertilizers should be in 
materials, like sulphate of ammonia or nitrate of soda, in which 
it is readily available. Corn, however, while it is also a speciés’ 
of grass and a vigorous feeder, grows more slowly, and is able 
to obtain considerable nitrogen from the organic matter decay- 
ing in the soil during the later part of the season. It makes 
some gain from the nitrogen supplied in nitrogenous fertilizers, 
but it does not respond so vigorously to their use as do the true 
grasses. - 
On the other hand, the legumes, such as clovers, soy beans, 
and cow peas, make very little gain, either in yield or in feed- 
ing value, from the use of nitrogen in the fertilizer. They make 
considerable increase in yield when the mineral fertilizers are 
used. A large part of their nitrogen they take from the air. 
In brief, the experiments teach that, (1) the grasses are 
greatly benefited by the proper use of nitrogenous fertilizers; 
= 
