22, EF. A. CARLSON 
TABLE 9. Amount oF NITROGEN IN Crops. SeErRteES I] 
Burnt Nitrogen in crops 
Plat Crop Fertilizer lime (pounds per acre, 
(pounds) |total for eight years) 
Rotation with- i 
202 0 : 
7202 out legume Farm enue Yay) 
Rotation with- e 
ad - 0 
7208 ae Grane Farm manure 9,000 714 
~ | Rotation with 
TO)! 0 
7205 legume Farm manure 690 
Rotation with 
a5 9 
7211 legume Farm manure 9,000 89 
7206 | Grass Farm manure 0 312 
7212 | Grass Farm manure 9,000 397 
7214 Rotation with- = 
ie out legume |Farm manure and K,SO, 0 652 
7215 Rotation with- |marm manure and K.SO, 9,000 703 
out legume 
table 7. and that removed by the crops, the advantage from the 
growing of legumes is fully substantiated. The crops in rota- 
tion with legumes removed more nitrogen than did the crops in 
rotation without legumes. In this connection it is important to 
note also in table 7 that the plats in rotation with legumes con- 
tained more nitrogen than did the plats in rotation without leg- 
umes. While the plats kept in grass contained more nitrogen 
than did the plats in rotation, there is a marked difference in 
the amount of nitrogen removed by the hay crop as compared 
with the crops in rotation with legumes. The results show that 
the rotation with legumes used in these experiments supplied 
more nitrogen than did the rotation without legumes or the 
grass. 
Total yields of crops on plats in Series II 
The total yields of crops in Series II are represented in 
figure 2. The limed plats show a greater yield than the unlimed 
plats. This was true also of the plats in Series I. The total! yields, 
