The Bulletin. 7 



on a third plat nitrate of soda furnished one-fifth of the nitrogen, the 

 balance coming from dried blood, all being applied before planting. 

 The blood was applied one-half at planting and one-half about July 1, 

 on one plat ; one-half at planting, the rest of the nitrogen coming from 

 nitrate of soda which was applied July 1 on another plat, and on a third 

 plat four-fifths of the nitrogen was supi^lied by blaod and one-fifth by 

 nitrate of soda. The most economical method of application and the 

 one which made the highest yield of seed cotton was the one which 

 received half of the nitrogen as dried blood in the row at planting with 

 normal quantities of phosphoric acid and potash and the remaining 

 half of the nitrogen as a side dressing in the form of nitrate of soda 

 about July 1. 



9. Where 400 pounds of fertilizer were applied each in the drill 

 before planting, broadcast before planting, and divided into two equal 

 parts, one-half being applied in the drill before planting and the other 

 half as a side dressing about July 1, the results are not uniform, but 

 on an average seem to indicate best returns from applying one-half 

 of the fertilizer in drill at planting and other half alongside the row 

 about July 1. 



10. Where only 400 pounds is used to the acre the best and most 

 economical returns will be in the drill or alongside the row rather than 

 to be applied broadcast. 



11. Our analyses of the various soils of the State indicate that these 

 results will apply to the sandy and fine sandy (Norfolk) loams of the 

 upper Coastal Plain section of the State. 



12. In the production of cotton on these soils, taking the results here 

 reported as a whole, it is recommended that at least 400 pounds of 

 fertilizer be used and as much more as can be afforded up to 1,000 

 pounds per acre. The fertilizer can be most profitably applied in the 

 drill before planting; one-half at planting and the other half as a side 

 dressing about July 1 ; one-half of the nitrogen as blood, cottonseed meal, 

 fish scrap or tankage in the row at planting with all the phosphoric 

 acid and potash and the remaining nitrogen as nitrate of soda as a 

 side dressing about July 1 ; or all of the nitrogen in some of the recog- 

 nized organic forms of carriers of nitrogen with the phosphoric acid and 

 potash at planting. 



On land deficient in humus or where no considerable leguminous 

 crops or residues have recently been plowed into the soil, the fertilizer 

 constituents should be contained in the mixture in about the proportion 

 of 7 per cent phosphoric acid, 7 per cent of nitrogen, and 5 per cent of 

 potash. The nitrogen may be all derived from blood, tankage, cotton- 

 seed meal, or similar products, or in part from one or all of these, and 

 in part (up to one-half) from nitrate of soda. 



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

 potash, and acid phosphate the phosphoric acid. 



Four hundred pounds of the above mixture would contain 28 pounds 

 of available phosphoric acid, 28 pounds of nitrogen and 20 pounds of 

 potash, and 1,000 pounds would contain 70 pounds of available phos- 

 phoric acid, 70 pounds of nitrogen, and 50 pounds of potash. The 

 required amounts of phosphoric acid in 400 and 1,000 pounds respect- 



