34 



tity of sodium nitrate doubled the yields were as follows : On field M 

 19 tons per acre and on field B 15.73 tons per acre. The sucrose ill 

 field B was three-fourths per cent greater than in field A. The changii 

 in the relative quantities of the potash and nitrate of soda did not ill 

 this case produce any favorable effect, but rather caused a falling of) 

 of almost 4 tons per acre in the yield of field B. 



When the nitrogen was supplied in the form of 24 bushels of cot toil 

 seed per acre with 720 pounds of acid phosphate and 120 pounds ai 

 muriate of potash, the yield on field A was 18.83 tons per acre for thl 

 three years, and on field B 1 5.95 tons per acre. The cotton seed did 

 not appear to produce quite as good an effect as the nitrate of sodaj 



When the quantity of cotton seed was raised to 57 bushels per acre- 

 more than doubled the other constituents remaining the same, thl 

 yield on field A for the three years was 21.87 tons per acre and on fiel<j 

 B 20.86 tons per acre. The increase in the quantity of cotton seel 

 applied thus produced a marked increase in yield. 



In another experiment the quantity of cotton seed was reduced t 

 30 bushels per acre and the quantity of acid phosphate raised to 1 ,001 

 pounds per acre, the quantity of potassium chlorid remaining thj 

 same, and 100 pounds of sodium nitrate being added to the ratio{| 

 Only one year's test of this combination was made, giving a yield 

 21.50 tons per acre on field A and 19.75 tons on field B. The sugar ii 

 the canes of field B was almost 1 per cent greater than in the canes 

 field A. This variation in the fertilizer did not increase the yield. 



In still another experiment the same fertilizers were used, but doubl 

 the amount of nitrate of soda was applied, one-half at the time of plant 

 ing and the other in July. The yield on field A, namely, 19.93 tm 

 per acre, is less than in the preceding experiment, and on field B thj 

 yield of 22.85 tons shows an increase. It can not be argued, therefoi 

 that the application of the double amount of sodium nitrate in 

 portions is of any practical value. 



The quantity of acid phosphate was reduced to 180 pounds and thj 

 quantity of sodium nitrate increased to 240 pounds, applied all at onoB 

 in the experimental work for 1905. The resulting yield was 18.11 

 tons on field A and 17.28 tons on field B. Diminishing the phoe 

 phoric acid to such an extent causes a loss which is not wholly ovejl 

 come by doubling the amount of sodium nitrate. 



When the amount of acid phosphate was doubled, the yield wa; 

 decreased about 1 ton on field A and increased about 1 ton on fielj 

 B j or acre, showing no marked effect either way. 



The other data tabulated for single years can be sufficiently inter 

 preted by mere inspection and do not need any further elucidation 



