1917 J FIELD CROPS. 335 



In variety tests at the main station Express-350, with a yield of G74 lbs. of 

 seed cotton per acre, and Express-341 and Foster-120, with yields of 672 lbs. 

 each, were the leading varieties. Holdon, with a yield of 187 lbs., was lowest. 

 The medium early big boll varieties Wannamaker-Cleveland, Cleveland Big 

 Boll, and Miller are recommended for the hill portion of the State, due to good 

 qualities exhibited in tests extending over a number of years. 



At the Holly Springs substation, on valley land Trice, with a yield of 1,872 

 lbs. per acre, and Express-350, with 1,827 lbs., were best. Holdon, with a 

 yield of 995 lbs., was lowest. On hill land Wannamaker-Cleveland was first, 

 with SCO lbs., and SprouU Big Boll lowest with 600 lbs. Wannamaker-Cleve- 

 land, Trice, Express, and Unknown are recommended for the valley land of 

 this district. 



Results of variety tests at the Delta substation showed Lone Star-132 and 

 Express-350, with yields of 992 and 961 lbs. per acre, respectively, to be first, 

 with Holdon lowest with a yield of 292 lbs. Express, Allen Unknown, and 

 Foster-120 are recommended as good varieties for the Delta district. 



Further tabulated data show the variety averages from the three localities, 

 the rank of varieties grown for the last six years on a basis of the money 

 value per acre at each, the average length of certain varieties grown for sis 

 years, and the quantity of cotton ginned annually per county in Mississippi 

 from 1907 to 1916. 



Variety selections and individual selections of hybrids at the main station 

 are reported in an effort to secure wilt-resistant strains and strains that could 

 be grown profitably under boll-weevil conditions. Covington-Toole has given 

 good results under wilt conditions but matures too late for regions badly in- 

 fested with weevil. Wannamaker-Cleveland is reported as being an earlier- 

 maturing strain and as also possessing good wilt-resistant qualities. 



Spacing tests were conducted with varying results. At the main station the 

 best yields were secured from rows 3 ft. apart, with 12 in. between plants in 

 the row, while at the Holly Springs substation 3.5 ft. between rows gave the 

 best yields. Conflicting results were secured at the Delta substation, but in 

 every case the thinned rows outyielded the unthinned rows. Extensive tests 

 of the single-stalk method of cotton culture were conducted at the main station 

 and results obtained comparable with those of Cook (E. S. R., 31, p. 433), 

 Meade (E. S. R., 33. p. 730), and others. 



Methods for the development and maintenance of good cotton varieties are 

 briefly outlined and the danger of deterioration of cotton seed at the public gin 

 emphasized. 



Extension of cotton production in California, O. F. Cook (U. S. Dept. Agr. 

 Bui. 533 {1911), pp. 16). — This bulletin discusses the possible development of 

 the cotton industry in California, with special reference to the long-staple types 

 of cotton. 



A brief history of cotton growing in California is given. Recent demonstra- 

 tions have been made in the Imperial Valley and the Colorado Valley in extreme 

 southern California, but the San Joaquin and other northern valleys contain 

 much larger areas of irrigated and readily irrigable land available for cotton 

 production. 



Experimental plantings indicate that the Egyptian type can be grown in the 

 southern part of the San Joaquin Valley, while in the northern parts Durango, 

 or other long-staple Upland varieties, are more likely to succeed. 



The labor requirements and other economic phases of cotton production are 

 discussed. The author believes that the cost of labor is not so much a limiting 

 factor as the scarcity, but also believes that the less acute demands made by 



