168 



stubble of the IcJiUiiH^s to tlic extent of 2.01 and 2.15 

 tons, an average of 2.08 tons of hay per acre, valued at 

 113.87. The avenujc increa.se icas 57 per cent. 



What Citors Wkue Most Favouakly Affected by the 

 ViNKS OR Stukble of Cowpeas and Velvet Beans. 



The data in the following;' tiible answer this question. 



Increase in first crop attributable to vines or stubble of 



cowpeas and velvet beans. 



The percentafT:e increase attributable to either the 

 vines or stubble of cowpeas and velvet beans was greater 

 with fall oats and wheat than with cotton, corn or 

 sorghum. In other words, the crop that was best able 

 to utilize the nitrogen of the legumes was that one 

 which left the land unoccupied for the shortest time be- 

 tween the maturing of the legume and the beginning of 

 the new growth. Unpublished parallel experiments 

 with hairy vetch employed as fertilizers confirm 

 this latter conclusion. All the facts before us 

 indicate that after the vines or stubble of a le- 

 gume are plowed under in a sandy soil the seed of the 

 succeeding crop should be planted before the lapse of 

 many weeks. The early occupation of the soil by roots 

 of the young plants will serve to retain much nitrogen, 

 which would be leached out and carried aw^ay in the 

 drainage water if the ground should remain unoccupied 

 for several months. 



