14 



MASS. EXPERIMENT STATION BULLETIN 339 



the other hand, was greatest in the straw and least in the leaves. The analyses 

 of the finished manure show that the rate of decomposition of the cellulose was 

 much greater than that of the lignin. 



Table 2. — Lignin and Cellulose in Artificial Manures 



Original leaves alone 



Manure from leaves, garbage and cyanamid . 

 Manure from leaves and ammonium sulfate 

 Manure from leaves and cyanamid . 



Original corn alone 



Manure from corn and ammonium sulfate 

 Manure from corn and cyanamid 



Original straw alone 



Manure from straw and ammonium sulfate . 

 Manure from straw and cyanamid 



COOPERATIVE TOBACCO INVESTIGATIONS 



Conducted by the Bureau of Plant Industry, United States Depart- 

 ment of Agriculture, in Cooperation with the Massachusetts Agri- 

 cultural Experiment Station. 



C. V. Kightlinger, U.S.D.A., in Charge 



Black Root-Rot. (C. V. Kightlinger.) Three of the thirty-six strains of 

 Havana Seed tobacco tested comparatively during the preceding five years of 

 investigation, were selected for further testing in 1935. This was done in con- 

 tinuation of the attempt to find strains which may be acceptable under Con- 

 necticut Valley conditions for resistance to black root-rot, and for type of plant, 

 type and quality of leaf, gross yielding capacity, and such other properties as 

 may be necessary in order that the strains may be acceptable to tobacco growers 

 and cigar manufacturers. 



Two strains of Havana Seed tobacco which possess between them in accept- 

 able degrees those properties which the new strains must combine in order 

 to fulfill the objectives of the investigation, were grown for control purposes 

 in these tests. One strain was Havana Seed of the sort that is grown most 

 commonly at present in the Connecticut Valley. When grown under favorable 

 tobacco-producing conditions, this strain is ordinarily satisfactory for type of 

 plant, type and quality of leaf, and gross yield of tobacco ordinarily acceptable 

 to cigar manufacturers. However, like all other strains of common Havana 

 Seed tobacco, it is sufficiently susceptible to black root-rot to make its use un- 

 satisfactory, when it is grown under soil conditions suitable for the development 

 of the disease. The other strain was Havana Seed 142A3. This strain, although 

 not immune, is nevertheless highly resistant to black root-rot and ordinarily 

 is acceptable for gross yields when it is grown under soil conditions that are 

 suitable for the development of the disease. It produces more heavily under 

 black root-rot free conditions. Unfortunately this strain is not entirely accept- 



