15 



produced a better quality of leaf than other forms of nitrogen. A 

 test with complete and incomplete fertilizer applications for tobacco 

 was made in 1892. 1 A yield of 1,460 pounds of cured leaf per acre 

 was obtained from an application of 80 pounds of nitrate of soda. 80 

 pounds of dried blood, 160 pounds of muriate of potash, and 140 

 pounds of double superphosphate per acre and a yield of l,620pounds 

 was obtained from an application of double these amounts. An appli- 

 cation of 160 pounds of muriate of potash per acre resulted in a yield 

 of 1,390 pounds of cured leaf but the crop was poor in quality. Pot- 

 ash applied alone gave better returns than when applied with nitrate 

 of soda and dried blood or double superphosphate. The complete 

 fertilizer mixtures produced the best yields and the heavy application 

 the best financial results. 



In 1893 2 fertilizers were used on soil in a good state of fertility. 

 An application of 300 pounds of carbonate of potash and magnesium, 

 160 pounds of nitrate of soda, and 140 pounds of double superphos- 

 phate per acre increased the yield of cured leaf by 255 pounds per 

 acre and. when 160 pounds of muriate of potash was substituted for 

 the carbonate of potash and magnesium, the yield was increased '265 

 pounds. Incomplete fertilizer mixtures were least effective. 



In 1895 3 the experiments were conducted under rather unfavorable 

 conditions. Tin 1 author concludes from the results obtained that sat- 

 isfactory results may be obtained on worn Kentucky soils by applying 

 potash fertilizers, especially when used in connection with nitrogenous 

 fertilizers. 



The results obtained in 1896* confirm the conclusions of the previous 

 season. 



The Maryland Station conducted fertilizer tests in different tobacco- 

 growing sections of Maryland in 1891 5 and 1892. Dissolved South 

 Carolina rock and dissolved bone black proved to be profitable sources 

 of phosphoric acid, and high-grade sulphate of potash followed by 

 cotton-seed hull ashes was found to be the best form of potash. The 

 author concludes that nitrogen should be applied in two forms: One- 

 half as nitrate of soda and the other half in some organic form, such 

 as dried blood or tankage. 



In 1892 the North Louisiana Experiment Station at Calhoun con- 

 ducted fertilizer experiments with tobacco on red sandy and gray 

 sandy soil. Potash had little or no effect on the increase of the crop, 

 but nitrogen either in the form of nitrate of soda, sulphate of ammonia, 

 cotton-seed meal, or dried blood caused a marked increase in the quan- 

 tity produced. An application consisting of cotton-seed meal, acid 



1 Kentucky Station Bui. No. 45. 4 Ibid. No. 66. 



-Ibid. No. 55. -'Maryland Station Bui. No. 26. 



3 Ibid. No. 6:-!. 6 Louisiana Stations Bui. No. 20, 2d ser, 



