8 The Bulletin. 



of soil, the best and most economical method of application is in the 

 drill before planting. 



12. Our soil analyses of the varions soils of the State indicate 

 that these results will apply to the red (cccil) clay loams, red (ceeil) 

 clays and valley soils of the Piedmont, and in like manner the soil 

 analyses and experiments on the mountain soils indicate that they 

 will apply to the mountain sections of the State also. 



13. For the production of corn on this soil, taking the results here 

 reported as a whole, it is recommended that 300 to 500 pounds of 

 fertilizer be used per acre. The fertilizer can be most profitably 

 ajiplied in the di'ill before planting, though there is no objection to 

 dividing the application into two paj-ts, putting out one-half in the 

 drill before planting and the other half as a side dressing around 

 July 1, according to gi'owth and season. The fertilizer mixture 

 should contain about 10 per cent available phosphoric acid, 1^ per 

 cent of potash, and 5 per cent nitrogen ; per cent nitrogen is not 

 too much on lands which have been growm continuously or practically 

 so in cotton, corn, and small grain. Five per cent nitrogen is cqnal to 

 6.08 ammonia. The nitrogen may be all derived from dried blood, 

 tankage, cotton-seed meal or similar products, or in part from one or 

 all of these and in part from nitrate of soda. Nitrate of soda may be 

 used as the entire source of nitrogen w'hen divided into two parts. 

 Kainit, manure salt, sulphate or muriate of potash may furnish the 

 potash and acid phosphate the phos])horic acid. 



Three hundred pounds of the above mixture would contain 30 

 pounds of available phosphoric acid, 4^ pounds of potash, and 15 

 pounds of nitrogen; and 500 pounds would contain 50 pounds avail- 

 able phosphoric acid, 74 pounds potash, and 25 pounds of nitrogen. 

 The required amounts of phosphoric acid in 300 and 500 pounds 

 respectively of this mixture would be su])i)lied by 214.3 pounds and 

 357.1 pounds of 14 per cent acid phosphate, the nitrogen by 115.4 

 pounds and 192.3 pounds of 13 per cent dried blood, and the potash 

 by 22.5 pounds and 37.5 pounds of manure salt. Other materials 

 or other grades of these same materials may be used and it will not 

 be difficult, knowing just what they contain, to use such quantities of 

 them as may be necessary to furnish the desired quantities of plant 

 food, having in mind that it is the s])ecific number of pounds of phos- 

 phoric acid, nitrogen and potash that is desired rather than a given 

 weight of mixed fertilizer. 



It is not more, but perhaps less difficult to calculate the number of 

 pounds of nitrogen, phosphoric acid and potash to be ajiplied per 

 acre to any given crop from materials which are to be had than to 

 estimate the exact number of pounds of the materials to nud<e a 

 formula of a certain composition, as for example, in an 8-2-2 goods. 

 The question of filler does not have to be considered in doing this, as 



