16 



CROPPING SYSTEMS FOR THE BLACK LANDS OF TEXAS. 



clusively that there are several varieties which can be used in rehev- 

 ing the situation which has so far prevailed in the black-land region. 



USE OF LEGUMES IN THE ROTATION. 



As an example of how the annual legumes may be used in the 

 cropping systems already estabhshed, let us refer again to the rotation 

 in use on the Burns farm. The originator of this rotation was one of 

 the first to begin a test of all available legumes under our direction. 



Fig. 8.— Groit cowpeas grown in lyio near Richardson, Tex., on lieavy black-waxy soil. Root-rot was 



present, but the damage done was very slight. 



Finding several that w^ere very promising in so dry a season as 1910, 

 he is giving them field trials in 1911 so that in 1912 he ma\'- select for 

 his use those which suit him best and thereafter modify his rotation 

 somewhat, as in Table III. 



Table III. — Proposed rotatioris, showing possible use of legumes in a cropping system. 



[Cir. 841 



