FIELD CROPS. 635 



Russell Big Boll, and Mortgage Lifter produced more than 1,000 lbs. each. It 

 is concluded that no one variety is suited to a single soil and that A^arieties 

 must be selected which are adapted to the various phases of each soil type. 



Varieties of American upland cotton, F, J. Tyleb (C7. 8. Dept. Agr., Bur. 

 Plant Indus. Bui. 1G3, pp. 121, pis. 8, figs. 67). — The economic botany of cot- 

 ton, the origin of upland varieties, stability of variefies and influence of soil 

 and climate are discussed and the terms used in descriptions fully explained. 

 A classification of varieties is then given and discussed, and the results of tests 

 of 5 varieties, each grown in 4 different States, showing the relative number 

 and size of bolls and seeds, percentage of lint to seed, and the length and strength 

 of the lint are presented in tabular form. Among 10 varieties, an average of 

 5S.4 5-locked bolls or 72..3 4-locked bolls yielded a pound. Three-locked bolls of 

 the King variety ran 149 to the pound. 



Descriptions of a large number of varieties comprise the greater part of the 

 bulletin. A statement is made of the gi'oup to which each variety belongs, its 

 geographical distribution, the publications in which it is mentioned or de- 

 scribed, the number of bolls per pound, seeds per pound, the length of lint, 

 strength of single libers, and percentage of lint to seed. A description of the 

 plant and a historical sketch of the variety are also given in many instances. 



Cotton culture, J. M. Kimbrough (Georgia Sta. Bui. 89, pp. 67-8i, figs. 2). — 

 In a test of .34 varieties, Cleveland Big Boll, Triumph, and Moore Improved 

 stood first in yield with 1.675.44 or more pounds of seed cotton per acre, while 

 Triumph. Hope Mexican Early Big Boll, and Livsey Early Big Boll showed the 

 greatest freedom from anthracnose, having 1 per cent or less of diseased bolls. 



Tests of various complete fertilizers carrying equivalent quantities of phos- 

 phoric acid, potash and nitrogen were made to determine the most advantageous 

 sources of nitrogen and potash. In each case the standard for comparison was 

 the station formula, containing 444 lbs. acid phosphate, 33 lbs. muriate of potash 

 and 223 lbs. cotton-seed meal, and costing $7.83 per acre. In one test, there 

 was produced with this mixture a yield of 1.3S0.6 lbs. of seed cotton per acre, 

 while with the substitution of nitrate of soda and sulphate of ammonia for the 

 cotton-seed meal, making the cost $7.64 and $6.85, respectively, there was pro- 

 duced 1,427.71 and 1,502.11 lbs. of seed cotton per acre, respectively. The un- 

 fertilized plat in this series produced 889.2 lbs. of seed cotton per acre. 



When 132 lbs. of kainit were substituted for the muriate of potash, the cost 

 per acre was increased 9 cts. The yields of seed cotton were 1,420.89 lbs. 

 and 1.293.84 lbs. per acre, respectively, while the unfertilized plat yielded 

 663.92 lbs. per acre. As a preventive of rust, kainit was almost a failure. 



Sub.stituting tankage for all and for half of the cotton-seed meal resulted in 

 average yields of 1.357.51 lbs. of seed cotton per acre with the tankage formula, 

 1,496.24 lbs. with the taukage-cotton-seed meal formula, and 1,438.63 lbs. with 

 the standard formula. 



As compared with high grade guano, costing $7.23 per acre, the station 

 formula produced 33 lbs. more of seed cotton per acre the first year and 6.4 

 lbs. less the second year. When the fertilizer was applied and bedded on be- 

 fore planting. 56.27 lbs. more seed cotton per acre was produced than when 

 two-fifths was drilled in the opening furrows and bedded on, two-fifths applied 

 June 9 and the remaining one-fifth applied June 30. This was in general ac- 

 cord with results during the preceding season (E. S. R., 21, p. 538). 



Screened seed produced 92.73 lbs. more seed cotton per acre than did un- 

 screened seed. A brief discussion is also given on cotton wilt (Neocosmospora 

 rdsiufecta). 



Notes on cotton cultivation in Nyasaland, J. S. J. McCall (Nyasaland 

 Agr. and Forestry Dept. [Pub.], 1909, Xo. J,, pp. 4).— The area devoted to cot- 



