44 Thk Bulletin 



felltilizer mixtures to use for different crops 



For the average soils occurring in the county, with the exception of 

 Iredell loam, Congaree fine sandy loam, Mecklenburg clay loam, and 

 Mecklenburg loam, it is recommened for cotton, the use of 400 to 600 

 pounds of a mixture containing 10 to 12 per cent available phosphoric 

 acid and 2i/o to 4 per cent of ammonia. When the price of actual potash 

 is not greater than 5 to 6 cents per pound it has been found profitable 

 to use at least 2 per cent in the mixture. However, when the price of 

 potash is as high as at present, it will not generally be found to pay. A 

 mixture that will give approximately this proportion is the folloAving : 



Acid phosphate, 16 per cent 400 pounds 



Cotton-seed meal, T^/^ per cent 200 pounds 



Total 600 pounds 



Other mixtures may be used in which dried blood, fish scrap, sulphate 

 of ammonia, or nitrate of soda may be substituted for the cotton-seed 

 meal. In making the substitution it may be done by using 47 pounds of 

 blood, 75 pounds of fish scrap, 30 pounds of sulphate of ammonia, or 42 

 pounds of nitrate of soda for each 100 pounds of cotton-seed meal in the 

 mixture. If desired, especially on the sandier soils of the county, one- 

 third to one-half of the nitrogen may be put in at the time the cotton 

 crop is planted, reserving the other half to two-thirds to be added as a 

 side dressing in the form of sulphate of ammonia or nitrate of soda 

 about the first of July. 



For corn, small grains, grasses, sorghum, grown on average soils in 

 the county, except of the high phosphoric acid types indicated above, 

 from 250 to 400 pounds of a mixture containing 10 to 12 per cent avail- 

 able phosphoric acid and 5 to 6 per cent of ammonia will give good^ 

 returns. Potash up to 1^/^ to 2 per cent in the mixture has been found 

 to pay when this constituent is selling at normal prices. A mixture that 

 will give approximately the right quantities of nitrogen and phosphoric 

 acid is as follows : 



Acid phosphate, 16 per cent 200 pounds 



Cotton-seed meal, 714 pei' cent 200 pounds 



Total 400 pound 



s 



Jlere, as above, tlie other recognized suitable carriers of nitrogen may 

 be substituted for the cotton-seed meal in the proportions indicated. 



For clovers, cowpeas, soybeans, and other leguminous crops, 300 

 pounds of 16 per cent acid phosphate will usually be found satisfactory 

 on soils containing a moderate amount of organic matter. In many 

 cases this qnantity may be increased to 500 pounds to good advantage. 

 rotash-sui)plyiiig iiinterials are not usuallv necessarv on these soils. In 



