226 



at 15, "lugs" at 6, "tips" at 8, aud "trash" at 2 cents per pound. A 

 table shows the results obtained, averaging tbe yields from the two 

 experiments. In every instance where fertilizers were applied, except 

 with the combination of nitrate of soda and dissolved bone-black, there 

 was an increase over the crops from the unmanured plats, This in- 

 crease calculated for 1 acre amounted to from $16.70 to $107.70. The 

 best financial result was with the complete fertilizer; the second best 

 with a combination of sulphate of potash and nitrate of soda ; and the 

 largest profit with any single ingredient, with nitrate of soda. A finan- 

 cial loss followed the use of nitrate of soda aud dissolved bone-black in 

 combination; and the suiallest profit was with dissolved bone-black used 

 alone. 



l7i ivhat form should nitrogen he applied f — On one of three plats nitrate 

 of soda was applied at the rate of ItJO pounds, on another sulphate of 

 ammonia 120 pounds, and on another cotton-seed meal 310 pounds per 

 acre, these differeut quantities furnishing the same amounts of nitrogen. 

 The nitrogenous fertilizer was in'each case combined with sulphate of 

 j)Otash 160 pounds, and dissolved bone-black 320 pounds per acre. From 

 the table giving the yield of graded tobacco from each plat it would 

 appear that a better quality and larger yield were ])roduced with the 

 combination containing nitrate of soda than with either of the other 

 nitrogenous materials. 



In what form should potash he applied. — Sulphate and muriate of pot- 

 ash, each at the rate of 100 pounds aud of 320 pounds per acre, were 

 compared on four plats, tbe potash salt being in each case mixed with 

 160 pounds of nitrate of soda and 320 pounds of dissolved bone-black 

 per acre. The total yield of tobacco was in both trials considerably 

 larger where muriate of potash was used, and the tabular statement of 

 the graded crops seems to indicate that, contrary to the general belief, 

 the quality of tbe product was also superior where muriate was applied. 

 Thus, calculated on the basis of valuation given above, in the first trial 

 the yield with muriate was worth per acre $227.90, and with sulphate 

 $213.80; and in the second trial, with muriate, $212.90, aud with sul- 

 phate $154.10. 



Amount of nitrogen required per acre. — Six plats were used. Nitrate 

 of soda at the rate of 160 pounds per acre, sulphate of ammonia 120 

 pounds i^er acre, and cotton-seed meal 310 pounds per acre in three 

 cases and double these amounts in three. other cases, were added to a 

 mixture of sulphate of potash 160 pounds and dissolved bone-black 320 

 pounds per acre. "From the results obtained it would seem that 160 

 pounds of nitrate of soda or 340 pounds of cotton-seed meal would fur- 

 nish nitrogen in sufficient quantities for the crop, while it would take 

 rather more than 120 pounds of sulphate of ammonia." 



Amount of potash fertilizer required per acre. — The four plats used in 

 the experiment to determine what form of potash should be applied, 

 were also used to answer this question. 



