The Bulletin. 11 



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

 corn in 1903, 1901, 1906, and 1908; for fertilizer experiments with 

 cotton in 1905 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 summer of 1909. 



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

 peas in 1904, 1905, 1906, and 1907, a grain crop without fertiliza- 

 tion preceding the pea crop in each year except 1904; for fertilizer 

 experiments with cotton in 1908; and for fertilizer experiments with 



corn m 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, when it was cut up thoroughly with a disk harrow. 

 The rows were run off 3I/3 feet apart, the fertilizer distributed in the 

 drill and covered to a slight ridge, usually with one furrow of disk or 

 other cultivator. This was done some time prior to planting, so as 

 to give the ground time to settle before planting. Except the first 

 year (1903), when Culpepper's Improved was used, King's Improved 

 was the variety of cotton grown. The cotton was planted as soon as 

 the weather would permit in the spring, on the slight ridge made in 

 covering the fertilizer, but which was usually brought to a level, or 

 almost to a level, by the cotton planter. The cotton was well culti- 

 vated with 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 sea- 

 son, the crop being laid by between the 15th of July and August 1st, 

 according to season. The cotton was thinned as nearly as possible 

 to one stalk in the hill every 15 inches. 



FERTILIZATION AND FERTILIZER MATERIALS USED. 



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

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

 weighed out separately so that each row would get its 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 analyzed each year and applica- 

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

 ties of nitrogen, phosphoric acid, and potash required for each plat. 

 For the sake of simplicity and convenience in presenting the results 

 of a number of years' experiments, the fertilizer applications are 



