10 The Bulletin. 



THE PLATS, 



The plats on which these experiments were conducted were em- 

 braced in Fields A, B, and C. Fields A and B had been long in 

 cultivation and were badly run down when work was started in 1903. 

 The plats in Field A were laid off in two series parallel to each other, 

 there being twenty plats to the series, with a driveway or turn-row 

 between plats. The plats are one-tenth acre in size, or 217.8 by 20 

 feet, with space between plats sufficient for two rows of cotton or 

 other crops, the row on either side of each plat being fertilized like 

 the plat which it adjoins. 



The plats in Field B were laid out in a similar way and were 

 of the same size. 



The plats in Field C were part of an old field, covered wath broom- 

 sedge, small briars, and small pines in 1903. The pines were 

 grubbed out and the other growth turned under with a two-horse plow 

 in the spring of 1903 and cultivated in corn that year, with a ferti- 

 lizer application of 300 pounds per acre of the normal corn mixture. 

 In the fall of 1903 crimson clover was sown, but no stand was 

 obtained. The land was prepared in the spring of 1904 and laid oif 

 in plats of one-twentieth acre each, the size being 108.9 feet by 20 

 feet, with space between plats for two extra rows, the rows nearest 

 the plats being fertilized in each case like the plats they adjoin. 

 There is a four-foot space at the ends of the plats. There are two 

 series of sixteen plats each in this field, with driveway or turn-row 

 between. 



In the case of all plats on this farm there is a four-foot extra space 

 at the ends of plats. 



Field A. — These plats were used for fertilizer experiments 

 with cotton in 1903-'4:-'6 ; for fertilizer experiments with corn in 

 1905-'7; for general crop of oats without fertilizer in the fall and 

 spring of 1908; for fertilizer experiments with peas in the summer 

 of 1908, and for fertilizer experiments with cotton in 1909. In case 

 of each of the three crops the same plan or system of fertilization was 

 followed. By this is meant that plat one in all cases received only 

 nitrogen, plat two phosphoric acid, plat three potash, and so on, 

 though the quantities actually applied varied with the three crops. 

 The fertilization of the cotton plats was based on a normal applica- 

 tion of 400 pounds per acre of a mixture containing 7 per cent avail- 

 able phosphoric acid and 2 per cent each of nitrogen and potash. The 

 fertilization for corn was on basis of 300 pounds per acre of a mix- 

 ture containing 7 per cent available phosphoric acid, 3 per cent nitro- 

 gen, and IY2 per cent potash. For peas the fertilization was based 

 on a normal application of 300 pounds per acre of a mixture con- 

 taining 8 per cent available phosphoric acid, 1 per cent nitrogen, and 

 4 per cent potash. 



