For the purposes of the experiments herein described two 

 |)lot8 of ground were selected, whose soils are of the same 

 general type, but are widely different in point of fertility. 

 The soil of the Drake field is too poor for the profitable cul- 

 ture of cotton, while that of the Station garden has, by 

 proper management, been brought into a high state of cul- 

 tivation. The field plot stood idle the previous year, while 

 the garden produced two crops. The last crop was a winter 

 grass which was harvested just prior to breaking the soil for 

 these experiments. In the preparation of this land all the 

 stubble and roots, as far as possible, were removed by the 

 rake after the ground was thoroughly broken up. Each 

 piece of ground was divided into ten small plots, each 10x10 

 feet, and lying end to end. The garden strip was so located 

 that there was a slight drainage in a transverse direction. 

 In the Drake field, however, the peculiar conditions of the 

 surface were such that, to secure uniformity of soil, the strip 

 had to be so located that the drainage would be lengthwise, 

 plot 1 being the higher. In all cases a space four feet 

 wide was left between the plots. Three of the plots in each 

 strip were left unfertilized, while to the other seven the 

 three fertilizing constitaents were applied, singly and in 

 combination, as is set forth in Table I. In the final prep- 

 aration of the soil and in the planting and cultivation of the 

 cotton, all plots were treated alike. 



The first set of samples for analysis were taken during 

 the first week in June, when the plants were in the early 

 flowering stage. The second set were drawn about the 1st 

 of September, when the last blossoms were falling off, and 

 the early bolls were beginning to open. The entire stalk 

 above ground was taken, air dried, and prepared for analysis 

 in the usual way. 



It is proper to state here that all the field work for these 

 experiments was done for the writer under the supervision 

 of Mr. James Clayton, formerly assistant horticulturist of 



