The Bulletin. 93 



will contain: available phosphoric acid, G.2 per cent; potash, 9.2 per 

 cent; nitrogen, 5.2 per cent (equal to ammonia, 6.2 per cent). 



JSlo. 8— 



Acid phosphate 874 pounds 



Cottoii-seocl meal 782 pounds 



Nitrate of soda 1 10 pounds 



Sulphate of potash, high grade 228 pounds 



2,000 pounds 



In this formula one-fourth of the nitrogen is derived from nitrate 

 of soda, and the other three-fourths from cotton-seed meal. This 

 mixture will contain available phosphoric acid, 4.2 per cent; potash, 

 6.3 per cent; nitrogen, 4.2 per cent (equal to ammonia, 5.1 per cent). 



Five hundred and seventy-five pounds of No. 8 is equivalent to 600 

 pounds of a mixture analyzing 4 per cent available phosphoric acid, 6 

 per cent potash and 4 per cent ammonia. 



Three hundred and fifty to one thousand pounds of these mix- 

 tures should be used to the acre. 



The mixtures made from Formulas Nos. 2 and 3 are somewhat 

 more concentrated than that from No. 1, on account of cotton-seed 

 meal containing less ammonia than fish scrap and dried blood. The 

 three formulas are given to enable the use of any one of the three 

 main organic nitrogenous materials — dried blood, fish scrap and cot- 

 ton-seed meal. In the coastal sections fish scrap and meal are both 

 easily obtained; some distance inland meal is more accessible, while 

 in the more western end of the tobacco belt it will be found convenient 

 to use dried blood. All three are good sources of ammonia for tobacco. 

 The other materials — nitrate of soda, sulphate of potash, and acid 

 phosphate — are the same for all mixtures. 



Occasional requests, are made for formulas furnishing as much as 

 10 per cent of potash, and No. 4 has been arranged to meet needs of 

 this nature. It is kno^vn that excellent tobacco, in quality and quan- 

 tity, is gro^vn by the use of fertilizers of this class, and some of our 

 farmers greatly prefer them to others containing less potash. It takes 

 considerable observation and experimentation to determine the best 

 practice in matters of this kind. 



Formula No. 7 in. 1905, in some tobacco experiments conducted 

 on the bright-leaf soils of Granville County, gave very promising 

 results. Three hundi-ed and eighty-eight pounds per acre of this 

 mixture were used, which was equal to an application of 600 pounds 

 of a mixture analyzing 4 per cent available phosphoric acid, 6 per 

 cent potash and 4 per cent ammonia. 



A limited quantity of stable manure is very beneficial to tobacco, 

 and it succeeds well after peanuts. These materials add ammonia 

 to the soil, and where heavy applications of fertilizers are to be made 

 in connection with manure, and on peanut land, it would be well not 

 to have so much ammonia in the fertilizers as is used in the ones em- 



