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 thatj 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 



