EFFECT OF NITROGENOUS FERTILIZERS. 133 
proportion of protein in the crop than it had to increase the 
total yield of dry matter. 
EFFECT UPON THE COMPOSITION OF DIFFERENT SPECIES OF 
GRASSES. 
During the years 1891-98 a series of experiments, amount- 
ing to 32 in all, and comprising 114 plots, was carried on upon 
small plots in the grass garden, as noted on page 189. The plots 
usually included in the experiments were Nos. 0, 6, 7, and 9, 
according to the plan of special nitrogen experiments.* The 
nitrogen. was usually supplied in nitrate of soda. 
The size of the plots — 2 square rods — was so small that 
it seemed unadvisable to determine the total yields of the crop, 
hence the total yields of the food constituents could not be 
calculated. The percentages of the various food constituents 
in the crops were determined, however, by analyses of 
samples taken when the grass was in bloom, or in the early 
seed stage. The samples were gathered, weighed, cut, and 
sub-sampled as explained in the sampling of mixed grasses. 
The result of the experiments as shown by the percentages of 
protein, fat, etc., found in the crops from the different plots 
are given beyond in Table 11. The figures of this table are 
the averages given in bold face type in Table 35, page 190, 
which gives the analyses of the crops for all the years in which 
experiments were made. 
imate ingredients in hay of mixed grasses, with a comparison of the 
different plots on the basis of the yield from the mineral plots. 










PERCENTAGE OF YIELD 
AVERAGE YIELDS OF PROXIMATE CONSTITUENTS OF | ON THE BASIS OF THE 
HAY PER ACRE, YIELD FROM THE 
MINERAL PLOTS, 
Plot No. 
Dry aera | Nitrogen hee, | | ‘ 
Pattck Protein. Fat, free exiraer Fiber. | Ash. | Dry matter.| Protein. 
pee vibs, - | Ibs, Ibs. Ibs. | Ibs. | Percent. | Percent. | ~ 
1,675 121 61 882 527 1-83. | 71 62 0, 00 
2,368 195 * 82 1,194 759 | 138 100 100 62,60 
3,240 248 116 1,619 1,082 | 175 147 127 7,210 
4,202 366 164 2,036 1,4II | 226 177 188 Gy rt 
4,458| 432 | 169 2,148 | 1,470) 242 188 222 g, 12 
| 
| 

* Coe nace T1090. 
