60 STORRS AGRICULTURAL EXPERIMENT STATION. 
acre seem to give profitable returns. While the yield of dry matter 
has not generally been much increased by an tncrease of nitrogen 
beyond 50 pounds per acre, the percentages of nitrogen and of pro- 
tetn in both the grain and the stover have usually been highest in 
the crops where the largest quantities of nitrogen have been used 
in the fertilizer. 
The experiments with legumes, cow peas, and soy beans, tndt- 
cate that mineral fertilizers are of great value in increasing the 
ytelds of these crops, while nitrogenous fertilizers do not greatly 
increase either the yield or the percentage of protein in the crop 
over that obtained from the mineral fertilizers only. In the 
experiments thus far made by the Station the average results 
with cow pea fodder show practically no advantage from the use 
of nitrogenous fertilizers. In the experiments with soy beans 
grown for seed some increase seems to have resulted from the use 
of nitrogenous fertilizers, although that increase was small. The 
percentages and yields of protein in these legumes bore very little 
relation to the quantities of nitrogen used. The soy bean seeds, 
on the average, showed a slightly higher percentage of protein 
on plots supplied with nitrogen than on the plots supplied only 
with mineral fertilizers. Lut, on the whole, the experiments 
with cow pea fodder and soy beans seem to show that there ts little 
to be gained by the use of nitrogen in the fertilizers, while an 
abundance of the mineral ingredients ts very essential to securing 
good crops on soils and under circumstances stmilar to those of the 
experiments here described. 
The results of the sotl test experiment indicate that nitrogen 
and phosphoric acid are of prime importance for use on thts par- 
ticular soil in order to get good yteld of oats. The same ingredt- 
ents also produced the most marked results on the ytelds of corn 
during the three years tn which this crop has been grown in the 
votation. On the other hand, potatoes have responded more gen- 
erally to the use of potash. In general, then, the results seem to 
show that on this particular soil the peculiarities of the crop are 
of more importance than the deficiencies of the soil in regulating 
the demands of the fertilizers. It ts not wise, however, to base 
too broad generalizations on the results here obtained, for, in 
many cases where soil tests have been made by the Station on adtf- 
ferent farms throughout the State, the soil has been the controlling 
factor in regulating the demands for fertilizers. 
