The Bulletin. 11 



food per acre (to a depth of ten inches, estimating the weight of this- 

 ten-inch acre soil to be three million pounds) of: 



Nitrogen (jST) 2,010 pounds 



Phosphoric Acid (P2O5) 2,280 pounds 



Potash (K.O) 12,540 pounds 



Lime (CaO) 12,840 pound? 



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, thei-c 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 

 feet by 20 feet, with space between plats sufficient for two rows of 

 corn 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 are of 

 the same size. 



The plats in Field C were part of an old field, covered with 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 fertilizer 

 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 off 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 six- 

 teen 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 all plats. 



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

 cotton in 1903-4-G-9; for fertilizer experiments with corn in 1905-7; 

 for general crop of oats without fertilizer in the fall and spring of 

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

 1908. 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, 

 })Otash, and so on, though the quantities actually applied varied with 

 the three crojis. The fertilization of the cotton plats was based on a 

 normal application of 400 pounds per acre of a mixture containing 

 7 per cent available phosphoric acid and 2 per cent each of nitrogen 



