16 
BULLETIN 1180, U. S. DEPARTMENT OF AGRICULTURE. 
time of planting and the remainder as a spring top-dressing. Where 
lime was used, the rate of application was 2 tons of air-slaked material 
per acre. 
The growth on this group of plats was rather disappointing early 
in the spring, owing to a poor stand and the retarding effect produced 
by wet weather. However, as the season advanced very good stool- 
ing took place and the poor stand was partially overcome, resulting 
in fairly uniform growth on plats similarly treated. Since the appar- 
ent discrepancies in the yields shown in Table 6 may in many cases 
be explained by observations during growth, the two will be discussed 
together. 
Table 6. — Yields per acre of wheat, oats, rye, and grass from Section II of field No. 2. 
Limed or unlimed. 
Yields of grain and straw (pounds). 
Crop and fertilizer ratio. 
Series A.— 
Ammo- 
nium 
nitrate. 
Series B.— 
Sodium 
nitrate. 
Series C— 
Ammo- 
nium 
sulphate. 
Series D.— 
Cyanamid. 
Wheat: 
0-0-0 
160 
1,640 
2,400 
760 
2,520 
2,440 
720 
2,760 
2,320 
4-8-4 
...do 
1,520 
2,000 
4-8-4 
JAvnpA , 
760 
-80 
-440 
480 
Rye: 
0-0-0 
1,640 
2,440 
2,960 
1,760 
2,480 
3,440 
1,400 
2,800 
3,000 
4-8-4 
2,760 
2,200 
4-8-4 
Increase due to lime. . 
520 
960 
200 
—560 
1 
Oats: 
4-8-4 
2,880 
2,520 
3,320 
1,920 
2,200 
2,160 
2,400 
4-8-4 
2,720 
-360 
-1,400 
-40 
320 
TTnlimpfl 
Grass: 
4-8-4 
2,000 
2,920 
2,320 
2,720 
1,600 
1,640 
1,240 
4-8-4 
1,240 
920 
400 
40 
o 
The addition of lime, judging from Table 6, produced a rather 
marked increase in the growth of wheat fertilized with ammonium 
nitrate and cyanamid, while slight losses were shown with sodium 
nitrate and ammonium sulphate. However, the plats receiving the 
latter two sources of nitrogen had a very poor stand. Had the 
number of plants and the soil conditions been the same in all cases 
there is little doubt, judged by the results obtained by other investi- 
gators, that lime would have given increased growth with all sources 
of nitrogen and particularly with ammonium sulphate, since this 
material leaves an acid residue in the soil. 
The yields of rye were increased by additions of lime in the case of 
all of the fertilizers except cyanamid. It is barely possible that the 
lime exerted a harmful effect, but more likely the soil variations 
largely explain the results. The plat which yielded 2,760 pounds 
appeared to the eye to be naturally more fertile than the plat which 
yielded 2,200 pounds. 
