Iron (Fe) deficiency does not readily occur under field conditions. To better catalog this deficiency, we induced Fe stress under a controlled greenhouse study.
(Descriptions based on the book, Hunger Signs of Crops, 3rd Edition, edited by H.B. Sprague.) Under controlled greenhouse conditions, tobacco plants are stunted when Fe is limited. The upper foliage of the plant develops an interveinal chlorosis, initially as a pale green, then progresses to a yellow and finally bleached appearance (Figure 1). The progression of the symptomology can help diagnose the problem as the symptoms will progress as the starvation of Fe progresses. Advanced symptoms are viewable in Figure 3, with the plant on the right.
Symptoms appear to be similar to when magnesium is limited, but magnesium deficiency symptoms develop on the lower leaves. The location of the yellowing and interveinal chlorosis can help diagnose between Fe (top) and Mg (lower). Submit a tissue sample for analysis to help diagnose the problem.
Iron is required is very low concentrations, so deficiencies under field conditions is unlikely.
The sufficiency range for Iron is between 50 and 300 ppm for burley tobacco. A slight refinement of the range is available for flue cured tobacco, with 50 and 300 ppm Fe being recommended from planting until maturity, and a lower range of 40 to 200 ppm recommended at harvest for the upper, middle, and lower leaves.
Links to Flue-Cured Tobacco Information and Burley and Dark Tobacco Production Guides
Dr. Matthew Vann
Assistant Professor & Tobacco Extension Specialist Crop Science
Josh Henry (NC State M.S. student in Horticultural Science), Paul Cockson (NC State B.S. student in Agroecology), Ingram McCall (Research Technician in Horticultural Science), Rhonda Conlon (Extension IT at NC State), Matthew Vann (Tobacco Extension Specialist, Dept. of Crop and Soil Sciences), and Brian Whipker (Professor of Floriculture and Plant Nutrition in Horticultural Science).
Publication date: Jan. 1, 2017
La universidad N.C. State University y la universidad N.C. A&T State University se comprometen a llevar a cabo acciones positivas para asegurar la igualdad de oportunidades independientemente de la raza, el color de la piel, el credo, el origen nacional, la religión, el sexo, la edad, la condición de veterano de guerra, o la discapacidad de la persona. Además, las dos universidades acogen a toda persona independientemente de su orientación sexual.
The use of brand names in this publication does not imply endorsement by NC State University or N.C. A&T State University of the products or services named nor discrimination against similar products or services not mentioned.
Recommendations for the use of agricultural chemicals are included in this publication as a convenience to the reader. The use of brand names and any mention or listing of commercial products or services in this publication does not imply endorsement by NC State University or N.C. A&T State University nor discrimination against similar products or services not mentioned. Individuals who use agricultural chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label. Be sure to obtain current information about usage regulations and examine a current product label before applying any chemical. For assistance, contact your local N.C. Cooperative Extension county center.
North Carolina State University and North Carolina A&T State University commit themselves to positive action to secure equal opportunity regardless of race, color, creed, national origin, religion, sex, age, veteran status or disability. In addition, the two Universities welcome all persons without regard to sexual orientation.