134 FORAGE CROPS 
ing two crops, the yields of each are often as large 
as can be obtained from the larger- growing varie- 
ties. 
There are many other good varieties that possess 
in varying degrees the characteristics mentioned 
for this one. As a rule, the flint varieties are 
superior to the dent in the northern parts of the 
country. The smaller, quicker-growing varieties 
of the dent sorts are also satisfactory, although 
requiring much thicker seeding and a longer period 
of growth. 
Preparation of land 
The yield of the crop depends to a very consic- 
erable extent on conditions that are favorable for 
complete germination and very early growth. The 
importance of this point cannot be emphasized too 
strongly. Naturally, the preparation of the land 
and its treatment will depend somewhat on its 
condition and character. In the first place, if 
either clover or grass sod is used, it is generally 
good practice not to plow too deep, which is 
likely to turn up parts of the soil not thoroughly 
mixed with vegetable matter, and not in good 
physical condition. This admixture of subsoil has 
an unfavorable effect on quick and satisfactory 
germination. Therefore, relatively shallow plow- 
ing,— five to six inches,—is preferable. 
Plowing should be performed as early as it is 
