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Evapotranspiration Coefficient
Juan G. R., V. P. Alvarez. Bioclimatic coefficients "K" of the commercial tobacco varieties in Cuba.
Summary of the Technical Scientific I V Seminary of the Research Institute of Irrigation and Drainage. Havana Cuba, 1994/. / Juan G. R. Tobacco irrigation. Crop coefficients "K". Page 55-56, Madrid Spain, 2002
The crop coefficients "K" of tobacco, experimentally determined from the relationship of evapotranspiration with the evaporation of evaporímeter class "A" have overall averages values from 0.47 to 0.58, with coefficients of 0.54 for the 'Corojo' and 'Criollo' Varieties; 0.55 for the 'H 16-34-1'; 0.56 to tobacco 'Burley' and 'Speight G-28'; 0.58 for the 'H 7-5 - 1 ', 0.47 and 0.49 for ' Pelo de Oro' and 'Cabaiguán-7' varieties respectively. The top of the crop coefficients for the different varieties of tobacco in Cuba relate to the highest evapotranspiration and range from 0.62 to 0.69.
Table 2.4. Crop coefficients "K" of the tobacco varieties, determinate by the evaporímeter class" A".
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Commercial Varieties
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| Tobacco Varieties | Decennial coefficient of crop "K" | |||||||
| 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 | |
| 'Corojo' | 0,52 | 0,55 | 0,58 | 0,64 | 0,67 | 0,63 | 0,46 | 0,41 |
| 'Criollo' | 0,50 | 0,52 | 0,55 | 0,57 | 0,66 | 0,59 | 0,52 | 0,47 |
| 'Burley-37' | 0,51 | 0,53 | 0,55 | 0,58 | 0,66 | 0,64 | 0,59 | 0,49 |
| Speight G-28 | 0,47 | 0,53 | 0,56 | 0,62 | 0,68 | 0,69 | 0,57 | 0,48 |
| 'Pelo de Oro' | 0,48 | 0,50 | 0,53 | 0,56 | 0,62 | 0,55 | 0,41 | 0,40 |
| New Varieties | ||||||||
| 'H-7-5-1' | 0,54 | 0,59 | 0,62 | 0,67 | 0,68 | 0,61 | 0,54 | 0,53 |
| 'H-16-34-1' | 0,46 | 0,50 | 0,53 | 0,60 | 0,65 | 0,61 | 0,53 | 0,50 |
| Cabaiguán -7 | 0,44 | 0,54 | 0,59 | 0,63 | 0,68 | 0,59 | 0,42 | 0,41 |
Table 2.4. Crop coefficients "K" of the tobacco varieties, determinate by the evaporímeter class" A". (Continuation)
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Commercial Varieties
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| Tobacco Varieties | Decennial coefficient of crop "K" | |||||||
| 80-85 | 80-90 | 90-100 | 100-110 | 110-120 | 120-130 | Global Coefficient | ||
| 'Corojo' | 0,37 | - | - | - | - | - | 0,54 | |
| 'Criollo' | 0,44 | - | - | - | - | - | 0,54 | |
| 'Burley-37' | - | 0,45 | - | - | - | - | 0,56 | |
| Speight G-28 | - | 0,43 | - | - | - | - | 0,56 | |
| 'Pelo de Oro' | - | 0,39 | 0,40 | 0,37 | - | - | 0,47 | |
| New Varieties | ||||||||
| 'H-7-5-1' | - | 0,45 | - | - | - | - | 0,58 | |
| 'H-16-34-1' | 0,44 | - | - | - | - | - | 0,55 | |
| Cabaiguán -7 | - | 0,38 | 0,45 | 0,40 | 0,39 | 0,38 | 0,49 | |