[1. Arnold, N. P.: Grey flue-cured tobacco in Quebec; Canadex 181.532, Agriculture Canada, 1983.]Search in Google Scholar
[2. Arnold, N., C. Chong and M. Binns: A comparative study of the mineral nutrients in grey and nongrey flue-cured tobacco; Can. j. Plant Sci. 61 (1981) 703-710.]Search in Google Scholar
[3. Bonner, C. E.: Toxicity of manganese to Turkish tobacco in acid Kentucky soils; Soil Sci. 39 (1935) 15-33. 4, Cochran, W. G., and G. M. Cox: Experimental de-. signs; John Wiley & Sons, Inc., New York, N.Y., 1968.]Search in Google Scholar
[5. Elliot, J. M., and M. E. Back: A preliminary study of grey tobacco in Ontario; Tob. Sci. 7 (1963) 105-109.]Search in Google Scholar
[6. Elliot, J. M., and B. J. Finn: The influence of manganese, iron, calcium, phosphorus, and chlorine on the occurrence and chemical composition of grey tobacco in Ontario; Tob. Sci. 10 (1966) 35-40.]Search in Google Scholar
[7. Gayed, S. K.: Tobacco diseases; Agric. Can. Publ. 1641, 1978.]Search in Google Scholar
[8. God bout, G.: Etude pedologique du comte de Berthier, Ministere de l'Agriculture, Province de Quebec; Bull. Tech. No. 5, 1957.]Search in Google Scholar
[9. Jacobson, H. G. M., and T. R. Swanback: Manganese content of certain Connecticut soils and its relation to the growth of tObacco; Agron. J. 24 (1932) 237-245.]Search in Google Scholar
[10. Lagatu, H., and L Maume: Variations des rappons physiologiques en correlation avec la maladie du feu sauvage chez la feuille de tabac; C.R. Acad. Sci. 201 (1935) 374-376.]Search in Google Scholar
[11. Lajoie, P. G.: Etude pedologique des comtes de l'Assomption et de Montcalm; Ministere de l'Agriculture du Canada, 1965.]Search in Google Scholar
[12. Mason, J. Y., and M. T. Lea: Evaluation of tobacco; 9th Tobacco Chemists' Research Conference, North Carolina State College, Raleigh, N.C., 1955.]Search in Google Scholar
[13. Olsen, R. A., J. C. Brown, J. H. Bennett and D. Blume: Reduction of Fe as it relates to Fe chloro+ sis; J. Plant Nutr. 5 (1982) 433-445.]Search in Google Scholar
[14. Pageau, E.: Etude pédologique du comté de Joliette, Ministere de l'Agriculture, Province de Quebec; Bull. Tech. No. 8, 1961.]Search in Google Scholar
[15. Shinohara, T., T. Okamura, K. Eguchi and H. Kitano: Studies on the grey leaf of flue-cured tobacco, I. The occurrence of grey tobacco and cultural and other environmental conditions in the tobacco growing areas; Okay Tabaka Shikenjo 41 (1980) 17-28.]Search in Google Scholar
[16. Sprague, H. B.: Hunger signs in crops; Davis Mckay Co., New York, N.Y., 1964.10.1097/00010694-196409000-00014]Search in Google Scholar
[17. Wiltshire, G. H.: Clues in the search for the causes of slaty leaf; Tob. Forum of Rhodesia No. 20, 1966, 14-15.]Search in Google Scholar
[18. Wood, D. J.: Grey tobacco - Certain factors which contribute to this colour defect; 21st Tobacco Chemists' Research Conference, Durham, N.C., 1967. (Copy obtainable from author, BritishAmerican Tobacco Co. Ltd., Regent's Park Road, Southampton, England.)]Search in Google Scholar