36 EXPEBIMENT STATION RECOED. [Vol.38 



Several factors other than shattering are said to affect the yield of sweet 

 clover seed, resulting in a variation of from 2 to 10 bu. of recleaned seed per 



acre. 



The value of sweet clover straw as a roughage for live stock is briefly noted. 

 Analyses by the Bureau of Chemistry are reported. 



Tobacco experiments [1914], W. Freab, O. Olson, H. R. Keaybill, and 

 E. S. Ebb {Pennsylvania Sta. Rpt. 1915, pp. Sll-365, pis. 15).— The further 

 selection of Seedleaf or Broadleaf strains of tobacco in Lancaster County, ferti- 

 lizer studies, studies of wrapper and binder tobacco in Clinton County, and the 

 improvement of the burning qualities of cigar tobacco in York and Clinton 

 Counties are reported for 1914, in continuation of work previously noted 

 (E. S. R., 35, p. 532). Detailed notes on crop conditions, yields, plant measure- 

 ments, leaf quality, and rainfall are presented in tabular form. 



The ten strains of Seedleaf tobacco selected for trial in 1913 were subjected 

 to further selection in 1914, eliminating all but Slaughter, Espenshade, Hos- 

 tetter, and Cooper. A new Seedleaf strain quite widely grown in the Lancaster 

 County tobacco region and known as Hoffman was included in the 1914 tests and 

 is of the preferred form for filler tobacco. The average yields of three single- 

 line selections of each strain for 1914 amounted to 2,422.6 lbs., per acre for 

 Slaughter, 1,965 for Hostetter, 2,291.8 for Espenshade, 2,123 for Cooper, and 

 2,267.6 for Hoffman, vplth extreme differences in yield between the various 

 selections of each strain of 592.5, 622.5, 86.5, 178, and 287 lbs., respectively. 

 The differences in the Espenshade and Cooper strains are deemed no greater 

 than those due to soil variation, but in the case of the other strains, especially 

 Slaughter and Hostetter, it is thought that continued single-line selection may 

 result in marked increases in yield. 



Control experiments with manure alone and manure supplemented vnth acid 

 phosphate and sulphate of potash for tobacco in Lancaster County resulted in 

 average yields of 1,713 lbs. per acre for manure alone and 1,887 lbs. for manure 

 and commercial fertilizers, as compared with 1,325 lbs. from the unfertilized 

 check. The quality of the tobacco grown under the different fertilizer treatments 

 was studied by cigar tests made from the bulk-sweated leaf and resulted in an 

 average score of 67.5 points for tobacco grown with manure alone and 78.5 

 points for that grown with manure and commercial fertilizers. Five cooperative 

 fertilizer experiments in the county resulted in average yields of 1,694 lbs. per 

 acre for manure alone and 1,716 lbs. for manure and commercial fertilizers. 



The 1914 trials of wrapper and binder types of tobacco for the light Hunt- 

 ington sandy loam soils of Clinton and Lycoming Counties included the strains 

 previously tested and, in addition, two strains of Connecticut Havana (Suffield) 

 and one local Havana strain (King). Five strains were harvested by priming 

 and gave acre yields of 1,312 lbs. foT Shade Cuban, 1,621 for Big Cuban, 1,082 

 for Sumatra (U. S. seed), 1,828 for Ohio Hybrid, and 1,761 for Halladay Hybrid. 

 Of the remaining 13 strains harvested on the stalk, Slaughter was highest with 

 a yield of 2,103 lbs. per acre and Havana Suffield second with 1,604 lbs. These 

 tobaccos were scored for quality in 1915 from cigars and compared with the 

 highest-grade Sumatran wrappers. Big Cuban, primed, with a total of 71 

 points, was first, and Sumatra and Halladay, primed, second and third, respec- 

 tively, with total scores of 70.6 and 68.7 points. 



Spacing and topping experiments were continued, employing normal spacings 

 of 28 by 42 in. and close spacings of 28 by 36 in. for the Broadleaf types (Penn- 

 sylvania and Connecticut) ; and normal spacings of 14 by 42 in. and close spac- 

 ings of 14 by 36 in. for Havana strains (Local and Wisconsin). Topping heights 

 were: High, for Broadleaf, 16 leaves; for Havana, 18 leaves; low, for Broad- 



