496 INVESTIGATION BY CULTURE EXPERIMENTS 



three series of two plots each, one unfertilized and the other fer- 

 tilized chiefly with compost made as described below. A three- 

 year rotation has been practiced as follows : 



First year Cotton. 



Second year Corn and cowpeas. 



Third year Oats followed by cowpeas. 



By having three series, each crop may be represented every year. 



For cotton, 30 bushels per acre are applied of a compost made by 

 mixing 2 tons of acid phosphate with 100 bushels each of stable 

 manure and cotton seed. For corn, 30 bushels per acre are used of 

 a compost made with one ton of acid phosphate mixed with 100 

 bushels of stable manure and 100 bushels of cotton seed. After 

 preparing the compost, it is allowed to ferment for two or three 

 weeks, then thoroughly mixed, and after standing a few days 

 longer is ready for use. 



The oats are fertilized with 200 pounds of cotton-seed meal and 

 100 pounds of acid phosphate per acre, and the cowpeas are also 

 fertilized by applying 50 pounds of acid phosphate and 50 pounds 

 of kainit per acre. 



The following average results are reported by Director Dodson 

 in Louisiana Bulletin in, September, 1908: 



TABLE 104.1. LOUISIANA FIELD EXPERIMENTS AT CALHOUN: YIELDS PEE 

 ACRE: FROM 19 YEARS' RECORDS 



1 Computed at Louisiana prices, 3.8 cents a pound for seed-cotton, 50 cents a 

 bushel for corn, and 45 cents a bushel for oats. 



