38 BULLETIN 981, U. S. DEPARTMENT OF AGRICULTURE. 
time and the separation of grain from the legume seed is easy, growing 
grain crops in mixtures will be found impracticable. This objection 
does not apply with equal force to hay crops, because uniformity in 
maturity is not so essential. Several notable examples of such 
mixtures are found in American agriculture, the most common of 
which is timothy and red clover. Rye and vetch, oats and vetch, 
oats and field peas, and barley and field peas are other combinations 
illustrating this practice. 
-Cowpeas or soy beans are often sown with millet or sorghum by 
southern farmers, and the combination of these lezumes with Sudan 
grass has been found equally promising in the humid regions. (Fig. 
21.) Table VII shows in detail the results of mixed plantings of 
Fic. 21.—A mixed planting of Sudan grass and soy beans at the Arlington Experimental Farm, Va., 1914. 
these forage crops in the Southeastern States. Tests of the same 
mixtures were made in the semiarid regions, but in regions of limited 
rainfall the practice was found unprofitable. The Sudan grass 
almost invariably started growth quicker and overcame the legume 
plants by exhausting the available soil moisture before the legumes 
had become well rooted, or the grass increased in height so rapidly 
that they were shaded out, the result usually bemg that at harvest 
time only the Sudan grass was present in any quantity. 
The data in Table VII indicate that so far as the yields are con- 
cerned it makes little difference whether cowpeas or soy beans are 
used in the mixtures. The quality of the hay is first-class in both 
cases, but it is generally conceded that the soy bean, on account of 
