4 MASS. EXPERIMENT STATION BULLETIN 346 



Table 1. — Yield and grade of tobacco grown with different quan- 

 tities OF nitrogen 



* 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 1 . 00 Long darks (19" and longer) 30 



Mediums 60 Dark stemming (17" and shorter) 20 



Long seconds (19" and longer) 60 Brokes 10 



Short seconds (17" and shorter) 30 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. 



