Effect of Soil Gas Composition and Flooding on Growth of Nicotiana tabacum L1
- R. E. Williamson2
The responses of Nicotiana tabacum L. to flooding and to soil treatments consisting of combinations of O2, CO2) and N, gases were determined from leaf area and plant height changes and from final root weights. Leaf area and plant height were measured before treatment and after a 5-day recovery period following treatment; root weights were obtained after the recovery period. The plants were grown in acrylic containers of soil located in an artificially lighted, controlled environment room.
Flooding and pure N2 treatments for 24 hours almost prevented further growth. After 48-hour treatments with pure N2 and flooding, roots and shoots were almost dead. Growth of plants treated with 1% O2 or 1% O2 + 20% CO2 was significantly less than that of the control. The 1% O2 + 20% CO2 treatment reduced leaf growth significantly more than did 1% O2. Although 1% O2 and 1% O2 + 20% CO2 caused injury, plants treated with these gaseous mixtures exhibited near normal growth at the end of a 5-day recovery period. Permanent injury of tobacco by flooding is primarily due to lack of O2 in the root zone and not to excess CO2. Results obtained in the soil system were similar to those previously obtained in spray nutrient solution culture.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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