ANNUAL REPORT, 1936 



17 



The production data of Strains 13, 29 and 33, and the controls for the periods 

 of time and under the conditions indicated, are as follows: 



Grown on black root-rot free 

 land 



Strains Average 



Year of yield Average Crop 

 test per grade index 



acre index 

 (pounds) 



Grown on black root- rot 

 land 



Average 

 Year of yield Average Crop 

 test per grade index 



acre index 

 (pounds) 



*II. For duration of tests of respective strains 



III. For identical periods of time 



*See explanation in text. 



Grade index, as used here, is a number expressing the grading quality of tobacco produced under 

 the conditions of the experiment. It is based upon the percentage yield of each grade of tobacco 

 and the relative values of these grades of tobacco, given below: 



Lights 100 



Mediums 60 



Long seconds (19" and longer) 60 



Short seconds (17" and shorter) 30 



Long darks (19" and longer) 30 



Dark stemming (17" and shorter) 20 



Brokes 10 



Fillers 10 



The grade index is derived by multiplying the percentage of each grade of tobacco by the re- 

 spective rating of the grades, given above, and adding the products. 



Crop index, as used here, is a number expressing the crop value of tobacco produced under the 

 conditions of experiment. It is based upon the gross yields of tobacco in pounds per acre and the 

 grade index of the tobacco. Crop index is derived by multiplying the gross yield of tobacco in 

 pounds per acre by the grade index of the tobacco. 



Grade index and crop index and the adopted relative values of the different grades of tobacco, 

 as used here, do not necessarily represent current commercial prices of tobacco. 



The average measurements and determinations of types of plants and leaves 

 produced by Strains 13, 29 and 33 and their controls, for the years indicated, 

 when the strains were grown under favorable tobacco-producing conditions, 

 are as follows: 



