12 The Bulletin. 



and potash. The fertilization for corn was on basis of 300 pounds 

 per acre of a mixture containing 7 per cent available phosphoric acid, 

 3 per cent nitrogen, and 14 per cent potash. For peas the fertiliza- 

 tion was based on a normal application of 300 ponnds per acre of a 

 mixture containing 8 per cent available phosphoric acid, 1 per cent 

 nitrogen and 4 per cent potash. 



Field B. — These plats were used for fertilizer experiments with 

 corn in 1903-4-G-8; for fertilizer experiments with cotton in 1005 

 and 1907; for a general crop of oats without fertilizer in the fall and 

 spring of 1909, and for fertilizer experiments with peas in the sum- 

 mer of 1909. 



Field C. — These plats were used for fertilizer experiments with 

 peas in 1904-5-6-7; a grain crop without fertilization preceding the 

 pea crop in each year except 1904; for fertilizer experiments with 

 cotton in 1908; and for fertilizer experiments with corn in 1909. 



PREPARATION AND CULTIVATION. 



The land in all cases was well prepared by breaking with a two- 

 horse turning plow in the winter, usually January and February, to 

 a depth of 8 to 10 inches, and allowed to remain this way until just 

 before planting, Avhen it was cut up thoroughly with a disk harrow. 

 The rows were run off 4 feet apart, and the fertilizer distributed in. 

 the drill. 



The corn was well cultivated Avith weeders, harrows. Planet Jr., 

 and two-horse cultivators, requiring not exceeding two furrows to 

 row, making the cultivation deep at beginning and shallow toward 

 the close of the season, when root development of the plants was well 

 extended into the soil. The cultivation was repeated each ten days 

 or two weeks during the season, the crop being laid by when well in 

 silk. The corn was thinned as nearly as possible to one stalk in the 

 hill every 2^ feet. 



FERTILIZATION AND FERTILIZER MATERIALS USED. 



As already stated, the fertilizer was applied in the drill just before 

 planting the corn, the exact quantity of material for each row being 

 weighed out separately so that each row would get it^ proper amount 

 of the several fertilizer constituents. Acid phosphate was used as 

 the source of phosphoric acid; dried blood as the source of nitrogen, 

 except where there was a comparison of different nitrogen furnishing 

 materials, or where nitrate of soda was used as a part of the nitrogen ; 

 manure salt as the source of potash, and rock or building lime for 

 lime. The fertilizer materials were anlyzcd each year and a])plica- 

 tions made on basis of actual analyses, so as to give the exact quan- 

 tities of nitrogen, phosphoric acid, and potash required for each jilat. 

 For the sake of simplicity and convenience in presenting the results 



