FIELD EXPERIMENTS WITH FERTILIZERS. 195 
TABLE 45.—( Continued. ) 













= ae . 4 . ce w 
= Re aie doit a, 20 eh See 
cies — o rapes os _ One 
5 | FERTILIZERS. Oh oh We Bit bee ee So hs pe 
Lbs. $ Lbs. | Lbs. | Bu. Bu. 
( |1896| — | 28.0) 750) 12.5) — 
| | 11897} — 8.4) 210} 3.5) — 
00 = Nothing, - - - - | —4 |1898] — |19.2] 480) 8.0] — 
| | |1899) — | 27.5} 688) 11.5) — 
| \|Av.*| — [24.9] 699]10.7) — 
| ( |1896| 6.61] 36.9} 923) 15.4] 4.3 
| f | |1897| 6.61] 4.9). 373+ 6.2) 2.5 
66, Mixed Minerals, as No. 6a, - [4804 |1898] 5.87| 38.7| 968) 16.1] 8.0 
| | |18g9| 5.87| 44.7| 1118} 18.6! 6.5 
| LjAv.*| — VS0%1) 1003: 16.7) 6.3 

* Average omitting 1897. 
The amounts of nitrogen in the fertilizers and the proportion of 
protein in the crop.—As seen by the figures in Table 46 below, 
the percentage of protein in the crop from the plots with 
minerals only is in some cases smaller and in others larger than 
in the crop from the sections of plots with nitrogen in addition 
to the minerals. The average of the yields from the sections 
of both the mineral plots is somewhat smaller than the average 
yield from any of the sections of plots with nitrogen; but be- 
cause of the irregularity in this respect it can hardly be said 
that a lack of nitrogen in the fertilizer was accompanied by a 
smaller percentage of protein in the crop. In the crops from 
the sections of plots with the nitrogenous fertilizers, in the 
experiments of 1896 and 1899, the percentage of protein was 
largest where the largest quantities of nitrogen were used. 
‘The experiments of 1898, as has been suggested in the dis- 
cussion of experiments with other crops, may have been 
inodified by heavy rains in the growing season. 
It will be observed from the figures in Table 46, that not only 
the percentage of protein in the crop, but also the total yields 
of protein per acre were largest in several cases where the 
largest quantities of nitrogen were used in the fertilizers. On 
the whole, the experiments with this crop seem to indicate that 
the nitrogenous fertilizers tend to increase the yields of dry 
matter and of protein more than was found in the experiments 
with cow peas, but the increase does not correspond with the 
amounts of nitrogen used. 
