64 The Bulletin 



The results on this field show this type of soil to be chiefly deficient 

 in nitrogen and phosphoric acid as are the soils of the Charlotte No. 1, 

 Monroe and Gastonia fields. These results are in striking contrast to 

 those secured from Charlotte field JSTo. 2, on which the use of phosphoric 

 acid practically failed to show any increase in growth and yield of the 

 different crops used in the rotation followed on that field. In the pro- 

 duction of the seed of corn, cotton and wheat on Field E, phosphoric 

 acid on an average almost doubled the increased yield, over the unfer- 

 tilized plats, that were secured on an average from the nitrogen applica- 

 tions; while in the yield of stover and hay the use of nitrogen gave a 

 greater increase over the unfertilized plat than did the phosphoric acid 

 applications. The increase in yield of air-dried oat-and-vetch and crab 

 grass hay was more than doubled on an average with nitrogen than was 

 secured with the applications of phosphoric acid. The average gains for 

 nitrogen and phosphoric acid were: for nitrogen, 5.6 bushels of com 

 and 465 pounds of stover, 98 pounds of seed cotton, 1,010 pounds of 

 oat hay, 1 bushel of wheat and 490 pounds of wheat straw, and 4,300 

 pounds of mixed hay; and for phosphoric acid, 7.0 bushels of corn and 

 335 pounds of stover, 135 pounds of seed cotton, 890 pounds of oat hay, 

 5.5 bushels of wheat and 620 pounds of wheat straw, and 1,700 pounds of 

 mixed hay. 



Potash used with a nitrogen application seems to have had a bene- 

 ficial effect upon the production of crab grass and clover hay, but when 

 applied alone or with phosphoric acid alone it seems to have had a de- 

 pressing efl'ect upon the yield of the mixed hay. 



On an average, oats and corn, and the leguminous cover crops used 

 on this field were apparently the only crops of the rotation benefited by 

 the applications of lime. With the soil of this field as with others dis- 

 cussed above, the chemical analyses of the soil are in close accord with 

 the field results. In the surface 6^^ inches of this soil there is enough 

 potash present to provide for the growing of more than 100 one hundred 

 bushel corn crops, but the nitrogen and phosphoric acid supply of this 

 soil would be exhausted in 7 and 17 years respectively by the annual 

 growth of such crops. 



FERTILIZER EXPERIMENTS AT THE CENTRAL FARM. 



The soil of the Central form on which the experiments were conducted 

 is of the Cecil sandy loam type. 



The plats are embraced in Fields A and B. The soil of these fields 

 was badly run down when the experiments were started in 1902. The 

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

 being sixteen plats to the series, and the plats of the two series joining 

 directly on to each other without any driveway or turn row between the 

 series. At the east end of the first series, and at the west end of the 

 second series, there is a 10-foot driveway. The plats are one-twentieth 

 acre in size and measure 132 feet long and 161/^ feet wide. There is 

 neither a row nor extra space between the plats in the different series. 

 Field B lies immediately south of Field A, and the plats of this field 

 are laid out in a similar manner and are of the same size as those of the 

 latter field. 



