544 



EXPERIMENT STATION RECORD. 



the entire period and discusses those qualities of the crop determined 

 in the unferinented leaves. Reports on every crop have been given in 

 former publications (see p. 549). 



On G plats the effect of the quantity of nitrogen was determined. The 

 plats were annually treated with 340 lbs. of potash and from 140 to 190 

 lbs. of phosphoric acid per acre, chiefly in the form of cotton hull 

 ashes, in addition to the different amounts of nitrogen given in the 

 following table, which contains the statistics of the crops for the entire 

 period : 



Effects of different amounts of nitrogen — Yearly averages. 



Plat. 



Source of nitrogen. 



Cotton-seed meal 



Castor pomace 



Cotton-seed meal 



Castor pomace 



Cotton-seed meal 



Castor pomace 



Nitro- 

 gen 

 per 

 acre. 



Lbs. 

 105 

 105 

 175 

 175 

 210 

 210 



Yield of leaf tobacco per acre. 



Total. 



Lbs. 

 1.615 

 1,700 

 1,673 

 1, 700 

 1,839 

 1,863 



Lonj; 

 wrap 

 pers. 



Lbs. 

 740 

 803 

 705 

 760 

 957 

 996 



Short 

 wrap 

 pers. 



Lbs. 

 245 

 203 

 276 

 267 

 268 

 271 



Percent 

 age of 

 wrap- 

 pers. 



Number of 



pole-cured 



leaves to 



pound. 



Long 

 wrap- 

 pers. 



Short 

 wrap- 

 pers. 



Number of 



seconds 



holds Are. 



Long 

 wrap- 

 pers. 



Short 

 wrap- 

 pers. 



The application of 210 lbs. of nitrogen per acre, either in the form of 

 castor pomace or cotton-seed meal, gave a larger crop each year and 

 a greater percentage of wrapper leaf, which is the most valuable part 

 of the crop, than the application of 105 or 175 lbs. of nitrogen. 



"The plat having 210 Ihs. of nitrogen in the form of cotton-seed meal produced 

 224 lbs. more crop than the one having 105 lbs. of nitrogen. At 12J cts. per pound 

 this gain amounts to $28.06 per acre. The increased amount of fertilizer, 1,500 lbs., 

 at $25 per ton, costs $18.75; so that it has paid to use the larger quantity of fer- 

 tilizer, provided the quality of the leaf was not damaged by it. . . . The tobacco 

 from plats having the largest quantity of nitrogen (cotton-seed meal or castor 

 pomace) has in the average of four years' crop been of better quality than that 

 from plats with smaller amounts of nitrogen.'' 



In connection with these experiments a comparison of cotton-seed 

 meal and castor pomace as a tobacco fertilizer was made. The castor 

 pomace produced on an average for the 5 years 111 lbs. of tobacco more 

 per acre than cotton-seed meal. The author figures this increase to be 

 worth .$1.3.87, and states that as 210 lbs. of fertilizer- nitrogen in the 

 form of castor pomace costs $8.40 more than in the form of cotton-seed 

 meal, the net animal profit is not more than $5.47 per acre, provided 

 the quality of the crop is the same. From the relative rank of the 

 various crops he concludes that the average quality of the tobacco 

 raised with cotton-seed meal has been somewhat better than that of 

 tobacco raised with castor pomace. 



