COTTON FERTILIZERS 323 



(Fig. 147). Under unfavorable conditions, as on prairie 

 or waxy lime land, or with unsuitable fertilizer, or with the 

 use of excessive amounts, the increase was much less. 

 These estimates are for appropriate mixtures of high- 

 grade chemicals. 



Smaller figures would probably represent the increase 

 from a ton of ordinary cotton guano, or ready-mixed fer- 

 tilizer. 



If all the fertilizer experiments made by the experiment 

 stations be averaged, including those on soils not needing 

 fertilizers, the average increase drops far below one bale 

 for each ton of fertilizer. (Bui. No. 62, Bur. Soils/ U, S. 

 Dept. Agr.) 



291. Profit returned by fertilizers. Assuming an in- 

 crease of one bale (say 1500 pounds of seed cotton) for each 

 ton of well-proportioned and appropriate fertilizer applied 

 to four or five acres of land, an estimate can be made as 

 to the profit, under favorable conditions, afforded by a 

 judicious investment in fertilizer. Thus : 



To one ton complete fertilizer, estimated cost r ' r ' 



in cash $22.00 



To extra cost of picking and ginning the in- 

 creased yield, 1500 pounds, at 60 cents per 

 hundred 9.00 



By value of increased amount of seed, 1000 



pounds, at 75 cents per hundred .... $ 7.50 



By value of one bale of cotton, 500 pounds at 



10 cents per pound 50.00 



Possible profit, from use of one ton of fertilizer . $26.50 



$57.50 $57.50 



292. Advantages of high-grade fertilizers. Among 

 either factory-mixed, or home-mixed fertilizers, those of 

 higher grade, that is, containing higher percentages of 



