14 



MASS. EXPERIMENT STATION BULLETIN 432 



Results of small-plot tests to determine the comparative productiveness of 

 Havana 211 and the controls both under black root rot promoting conditions 

 and under favorable producing conditions in which the disease was not an im- 

 portant factor, are given in Table 3. The results as given are averages obtained 

 over a five-year period in the earlier part of the project before Havana K2 had 

 been developed. 



Results of similar tests with both Havana 211 and Havana K2 and the controls 

 are given in Table 4, and are averages obtained over the five->'ear period from 

 1940-1944 inclusive. 



Table 



-Average Productivexess of Havana 211 and Controls. 



St r. Tin 



Grown on 

 Black Root Rot Free Land 



Average 

 Yield 



per Aci e 

 (Pounds) 



.\verase 

 Grade 

 Index 



Average 

 Crop 

 Inde.x 



Grown on 

 Black Root Rot Land 



Average 



Yield 



per Acre 



(Pounds) 



Average 

 Grade 

 Index 



Average 

 Crop 

 Index 



Regular Havana Seed 2,050 417 855 1,323 .309 420 



Havana 142.... 2,200 .451 992 1,872 .362 678 



Havana 211 2,212 .476 1053 1,944 .407 791 



Table 4. 



.\verage Productiveness of Havana 211, Havana K2, and 

 Controls. 



Grown on 

 Black Root Rot Free Land 



Average 



Yield 

 per .Acre 

 (Pounds) 



.Average 

 Grade 

 Inde.\ 



-Average 

 Crop 

 Index 



Grown on 

 Riack Root Rot Land 



.Average 



v'ield 

 per .Aci e 

 ( Poundsi 



.Average 



Grade 

 Inde.x 



.Average 

 Crop 



Index 



Regular Havana Seed 1,803 .452 815 1,486 .382 568 



Havana 142 1,968 .421 829 



Havana 211 .....2,188 .481 * 1052 2,060 .444 920 



Havana K2 2,111 .470 992 1,984 .425 843 



Grade Index, as used here, is a number expres-ing the grading quality of tobacco sorted according 

 to the usual standards tor Havana Seed. It is based on the percentage yield of each grade of 

 tobacco in a crop and the relative ratings of these grades, which are percentages based on the light 

 wrapper grade as a standard of highest quality in Havana Seed tobacco. The relative ratings of 

 grades are given below: 



Light Wrapper 1 .00 Long No. 1 Darks (20" and longer) 40 



Medium Wrapper 70 Short No. 1 Darks fl8" and shorter) 30 



Long No. 1 Seconds (18" and longer) 70 Long No. 2 Darks (29" and longer) 20 



Short No. 1 Seconds (16" and .shorter) ... .30 Short No. 2 Darks (18" and shorter) 10 



Long No. 2 Seconds (18" and longer) 30 Fillers 10 



Short No. 2 Seconds (16" and shorter) ... .10 



Grade Index is derived by multiplying the percentage yield of each grade by its relative rating 

 and adding the products. Crop Index is derived by multiplying the yield of tobacco in pounds 

 per acre bv the .grade index o; the tobacco. 



Neither 'the adopted relative values of the different grades, nor the grade index, nor the crop 

 index represents commercial prices of tobacco. 



