322 SOUTHERN FIELD CROPS 



290. Amounts of increase from commercial fertilizers. 

 The results of several hundred fertilizer experiments 

 made on a great variety of soils in Alabama led to the con- 

 clusion that, as an average, each ton of fertilizer adapted 



FIG. 147. A FIELD OF COTTON. 



The plot on the left was unfertilized and yielded only 460 pounds 

 of seed cotton per acre ; that on the right received 640 pounds per acre 

 of a complete fertilizer and yielded 1206 pounds, an increase of 746 

 pounds of seed cotton per acre. 



to the soil should afford an increase of about 1500 pounds 

 of seed cotton, or one bale increase per ton of fertilizer 



