172 



AGRICULTURE 



Legumes that need inoculation. There are or have been 



tubercles on nearly 

 every cowpea plant 

 found in the region 

 where cotton grows. 

 Cowpea plants in the 

 North, however, have 

 no tubercles where 

 this crop is but little 

 grown. In the South- 

 ern states, where cow- 

 peas are generally 

 grown, the wind has 

 blown the germs into 

 almost every field. 

 However, in most 

 sandy soils in the 

 South, where crimson 

 clover, vetch, and al- 

 falfa are seldom 

 grown, the farmer 

 will need to inoculate 

 the seed of these three 

 very useful plants. 



Figs, in, 114 show how inoculation often helps these 



rarely grown legumes. 



EXERCISES. Ask your parents to tell you how much their crops 

 are usually increased by a preceding crop of cowpeas or clover. 



Examine every leguminous plant you can find. Make drawings of 

 tubercles on some of the leguminous plants you find. 



FIG. 114. CRIMSON CLOVER, THE SAME 



NUMBER OF PLANTS IN EACH BUNDLE 



On right, inoculated; on left, not inoculated. 



Grown at Ala. Agr. Expt. Station. 



