Food foe Plants. 33 



lint cotton per acre, was also carefully ascertained by 

 analyses and calculation, the figures being presented in 

 the following table. 



The weight of Nitrogen, phosphoric acid, potash, and 

 lime contained in a crop producing 300' pounds of lint is 

 given, and the relative distribution of these constituents 

 through different parts of the plant is also presented. 

 The weights of the different parts of the plant in a thor- 

 oughly dried condition are also given, and it will be noted 

 that the total dry tveight of the crop required to yield 

 300 pounds of lint is 2,470.8 pounds. 



Table VIII. 



Amounts of Fertilizer Constituents in Pounds Required to Produce a 



Crop of 300 Pounds of Lint. 



Phosphoric 

 Nitrogen Acid Potash Lime 



Lint — SOOlbs 0.54 €.27 1.77 0.21 



Seed — 507.1 lbs 17.95 7.10 5.73 1.52 



Burrs — 363.1 lbs 2 .90 1 . 74 11 . 22 4 . 14 



Leaves — 566.2 lbs 12 . 64 2 . 70 6 . 13 29 . 90 



Roots — 130.2 lbs 0.62 0.34 1.17 0.59 



Stems — 604.2 lbs 3.87 1.27 5.14 4.71 



Total — 2,470.8 lbs.... 38.61 13.42 31.16 41.07 



It appears from this table that to produce 300' pounds 

 of dry lint there are required 38.61 pounds of Nitrogen, 

 13.42 pounds of phosphoric acid, 31.16 pounds of potash 

 and 41.07 pounds of lime. 



The need of the cotton plant for liberal amounts of 

 Nitrogen being thus indicated by laboratory tests, the 

 writer has during the past two seasons supervised and 

 directed a series of experiments upon the farm of Mr. 

 J. C. Moore, near Auburn, Alabama, who was desirous 

 of securing a formula adapted to the growing of cotton 

 upon the sandy soil of his farm and of the immediate 

 section in which he resided. 



This soil is designated by the U. S. Soil Survey of this 

 region as the " Norfolk Sandy Loam." It is described 

 in the official report of the soil survey of Lee county as 



