The Bulletin 39 



the price of potash is as high as it is at the present time it will not 

 generally be found to pay with such crops as corn, cotton, and small 

 grains, certainly not if a proper system of rotation of crops is used. A 

 mixture that will give approximately the proportion indicated above is 

 as follows : 



Acid phosphate, 16 per cent 400 pounds 



Cotton-seed meal, TVo per cent 200 pounds 



Total 600 pounds 



Dried blood, fish scrap, sulphate of ammonia, or nitrate of soda may 

 be substituted for the cotton-seed meal in the mixture. 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 every 100 pounds of cotton-seed meal in the mixture. 



If especially desired on the more open sandier soils of the county 

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

 crop is planted in the form of some organic combination such as cotton- 

 seed meal, dried blood, or fish scrap, reserving the other half to two- 

 thirds to be applied as a side dressing in the form of sulphate of am- 

 monia or nitrate of soda about the first of July with crops planted in 

 the spring. It is believed that materials carrying phosphoric acid and 

 potash generaly had best go on at the time the crop is planted. 



For corn, small grains, grasses, and sorghum grown on the average 

 soils of the county except those high in phosphoric acid, from 250 to 

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

 able phosphoric acid and 5 to 6 per cent ammonia will give good re- 

 turns. Where leguminous crops, stable manure, or other materials 

 carrying organic matter fairly rich in nitrogen go back into the soil 

 the amount of nitrogen in the mixture might be materially reduced 

 one-third to one-half or more. Potash up to l^/o to 2 per cent in the 

 mixture may be expected to pay when this constituent is selling at nor- 

 mal prices. A mixture that will give approximately the right quanti- 

 ties of nitrogen and phosphoric acid for average soils of the county, 

 with exceptions noted, is as follows : 



Acid phosphate, 16 per cent 200 pounds 



Cotton-seed meal, 71/2 per cent 200 pounds 



Total 400 pounds 



Here, as above, the other recognized staple carriers of nitrogen may 

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



For clovers, cowpeas, soy beans, and other leguminous crops 300 

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

 satisfactory on soils containing a moderate amount of organic matter. 

 This quantity may in many cases be increased to 500 pounds per acre 



