6 The Bulletin. 



4. The average results show that lime alone was used at very small 

 profit, while in combination with nitrogen, phosphoric acid, and pot- 

 ash to make a complete fertilizer, the application was at a loss, the 

 complete fertilizer without lime producing larger yield and greater 

 I^rofit than when lime was used in connection' with them. It might 

 be well to bear in mind that lime alone on the plat in Field C, where 

 peas have been grown four years, gave good returns, though even here 

 lime in combination with a complete fertilizer gave less returns than 

 the fertilizer without the lime. 



On a whole, the indications are that this soil does not need lime 

 for cotton production. 



5. The amount of nitrogen in the normal fertilizer (400 pounds 

 per acre), applied in the cotton experiments, was 2^ per cent, or 

 10 pounds to the acre. This amount was varied so as to give 5, 10, 

 20, and 30 pounds of nitrogen per acre. The yields and profits did 

 not increase for the larger quantities of nitrogen. On an average, the 

 largest profit was obtained from the smallest amount of nitrogen, or 5 

 pounds per acre, though 20 pounds per acre produced the largest 

 increased yield. Five pounds of nitrogen would be supplied by 381/4 

 pounds of 13 per cent dried blood and 10 pounds by 77 pounds of 

 blood. 



6. The amount of potash in the normal fertilizer (400 pounds per 

 acre) used was 2^2 per cent or 10 pounds per acre. Varying this 

 amount so as to apply 5, 10, 20, and 30 pounds per acre respectively, 

 showed as an average of the results that 10 pounds of potash per acre, 

 or 214 per cent in the mixture, gave the most profitable returns. 

 Five pounds of potash would be supplied by 25 pounds of 20 per cent 

 manure salt and 10 pounds by 50 pounds of manure salt. 



7. The amount of phosphoric acid in the normal fertilizer (400 

 pounds per acre) was 7 per cent, or 28 pounds per acre. This quan- 

 tity wa's varied so as to apply 14, 28, 56, and 84 pounds respectively 

 of phosphoric acid per acre. The most profitable yield was from 28 

 pounds, though the largest yield came from an application of 84 

 pounds per acre. These amounts of phosphoric would be supplied by 

 100, 200, 400, and 600 pounds respectively of 14 per cent acid 

 phosphate. 



8. Varying the amounts of the normal fertilizer application from 

 200 to 1,000 pounds per acre gave increased yield and profits for all 



