170 STORRS AGRICULTURAL EXPERIMENT STATION. 
were applied. On the pots supplied with mineral fertilizers 
only, the plants were small, slender, pale yellow in color, and 
the total weight of the crop was light; the growth on the pots 
with the smallest (one-third) nitrogen ration was similar, but 
slightly heavier. In both these cases the plants had not ma- 
tured sufficiently to develop flower stalks; while in the next 
two groups of pots the plants were larger and coarser and more 
advanced in growth, and the total crop from the pots was 
heavier. On the pots with the medium (two-thirds) nitrogen 
ration there was a rather heavy, leafy growth, of fair color; 
and on the pots with the full ration of nitrogen there was a 
dense leafy growth, quite heavy and dark green in color. 
It will be seen from the data in the table above that the 
average percentages of nitrogen in the crops of the pots in the 
group to which the largest quantity of nitrogen was applied 
were less than was found where smaller amounts or where no 
nitrogen was used in the fertilizer. This might at first seem 
to indicate that the crops were unable to utilize the nitrogen 
left over from the first crop in proportions corresponding to 
the amounts present. It would seem more probable, however, 
that the differences in the percentages of nitrogen were due 
more largely to differences in the degree of maturity of the 
crops of different pots when harvested. As pointed out above, 
the growth was far more advanced on the pots to which the 
larger quantities of nitrogen were applied; the percentages of 
nitrogen in the crop would probably be less under such condi- 
tions. Many analyses of crops harvested in different stages 
of growth have shown that the younger and less mature the 
plants when samples are taken for analysis, the larger is the 
percentage of nitrogen contained in them. 
* 
EXPERIMENT WITH SOY BEANS, 1899. 
The experiment with soy beans, pots 48 to 64, was begun in 
1899, with four pots fertilized alike comprising each group. 
The soil was from the same source as that used in other pot 
experiments, but in order to insure a growth of tubercles on 
the roots an infusion of soil and water was made from a field 
which had grown soy beans for several years, but upon which 
no nitrogenous fertilizer had been used. ‘The water from this 
infusion was used several times early in the season in watering 
