New Yors AGRICULTURAL EXPERIMENT STATION. 343 
each of the three forms used, but sodium nitrate gives a much 
higher per cent over the unmanured than either ammonium sul- 
phate or potassium nitrate, which gave the lowest yield of the 
three, although it has potash in combination with its nitrogen. 
Potash alone gave too small an increase to be considered. 
Phosphoric acid gave enough increase, 16 per cent, to indicate 
that it would be helpful in increasing the crop, and when com- 
bined with potash the increase was equal to the sum of the 
increase of both alone, but the increase was only about half that 
realized from the potassium nitrate. With the combination of all 
three of the elements the yield was less than the mean yield from 
an equal amount of nitrogen alone. 
In field G ammonium sulphate gave the greatest increase, 26 
per cent, and the three elements combined gave 23 per cent 
increase over the two unmanured plats, E and J. Sodium nitrate 
and potassium nitrate yielded an increase of only 9 and 7 per cent 
respectively, which may be a difference due to local peculiarities 
in the several plats, and not to the fertilizers applied. 
Phosphoric acid alone increased the crop by 7 per cent, only 
about two-fifths as much as on field F. When combined with 
potash the per cent of increase was more than double, although 
potash alone did not give as much crop as the mean of the unma- 
nured plats. | 
Conclusions: From these results one can draw only limited 
conclusions : 
Ist. That in field F nitrogen in its most soluble form was 
preeminently the special fertilizer to increase the growth of grass 
under the conditions of this season. : 
2d. That the other elements can not be said to have exerted 
a positive influence on the crop, although when combined they 
did give a yield somewhat above a generous allowance for errors. 
3d. That muck and the rather poor quality of manure avail- 
able were unprofitably employed as a top-dressing for this one crop. 
Ath. In field G nitrogen makes by far the greatest increase, 
but the results do not indicate that a single element can be profit- 
ably used. 
5th. Sodium nitrate in field F was the only fertilizer from 
which a profitable return was realized. 
