The Bulletin. 21 



three fertilizer constituents gave a larger yield of cotton than did com- 

 plete fertilizer without lime. The average yield for the seven years 

 from this treatment was 142 pounds greater than for complete fertilizer 

 without lime. The profit, $17.62, is greater than that from any of the 

 other fertilizer combinations. 



Taking the experiments as a whole the average results show that : 



The combination of nitrogen and phosphoric acid gave the smallest 

 increase and also the least profit. 



That nitrogen and potash gave an average yield of 209 pounds more 

 seed cotton than did the nitrogen and phosphoric acid treatment, with a 

 profit of $14.11. 



Phosphoric acid and potash gave a slightly greater yield than nitrogen 

 and phosphoric acid, but not nearly as great as nitrogen and potash. 



ISTitrogen, added to phosphoric acid and potash, making a complete 

 fertilizer, increased the yield 131 pounds, and gave an additional profit 

 of $3.58. 



The results from lime alone, while contradictory on the two fields, 

 show a slight average increase and a profit of $2.16. In addition to com- 

 plete fertilizer, lime shows an increase of 151 pounds of seed cotton, 

 and its application here was at a profit of $6.17, and for complete 

 application— N P K L — the profit was $17.62. 



The main increased yields and profits came from the use of nitrogen 

 and potash. On the whole, practically no great beneficial effect was 

 seen from the phosphoric acid apiilication. The application of lime was 

 in general, accompanied with some profit. 



