28 The Bulletin 



crop is planted, reserving tlie other lialf 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 

 results. Potash up to l^/o 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 Lbs. 



Cotton-seed Meal, 71/2 per cent 200 Lbs. 



Total 400 Lbs. 



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

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



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

 300 pounds of 16 per cent acid i^hosphate will usually be found satisfac- 

 tory on soils containing a moderate amount of organic matter. This 

 quantity may be increased to 500 pounds to good advantage. Potash 

 supplying materials are not usually necessary on these soils. In case the 

 land is very poor, so that the young plants do not start off well, a suffi- 

 cient amount of cotton-seed meal, dried blood, or other nitrogen-furnish- 

 ing material may be added Avhich will supply nitrogen to give 1 to 2 per 

 cent in the mixture. When 300 to 500 pounds of 16 per cent acid phos- 

 phate is used, 50 to 75 pounds of cotton-seed meal or its equivalent in 

 nitrogen content of blood, or other nitrogen carrier, may usually be used 

 to good advantage. If it is discovered after the plants have gotten well 

 started in this growth that nitrogen is needed, as will be indicated by a 

 small slow growth and pale sickly ai^pearance, a top dressing of 50 to 75 

 pounds of nitrate of soda per acre may usually be applied with profit. 



With all the fertilizer mixtures given above as the amount of organic 

 matter turned back into the soil increases, the amount of cotton-seed meal 

 or other nitrogenous material may be reduced. In fact, when the supply 

 has been made liberal in the soil it may be possible to entirely leave out 

 of the mixture any nitrogen-carrying material. It should be the aim of 

 the farmers of the county, as nearly as practicable, to obtain this con- 

 dition with their soils. 



CROP ROTATION NECESSARY FOR I'ERMANENT SYSTEM OF AiiRIcrLTTRE IX 



THE COUNTY 



It is the duty of every owner of farm lands in the county to follow 

 methods of crop rotation and fertilization that shall at least maintain 

 the producing power of fertile soils and Avhich shall build up the produc- 



