Effects of different irrigation quantities on plant growth and photosynthesis characters of flue-cured tobacco

The experiment was conducted in the lysimeters to study influence of six different irrigation regimes on plant growth and photosynthesis characters of flue-cured tobacco aiming to provide technical and theoretical basis and irrigation parameters for high efficient crop production. The chosen variety of flue-cured tobacco was Yunyan 85 and it was irrigated by total irrigation quantities at 60 L, 85 L, 135 L, 155 L, 165 and 205 L per plant during the whole growing season. The results showed that plant height, leaf area and dry matter yield of tobacco were improved significantly as irrigation water quantity increased to some extent, but excessive irrigation water quantity could reduce the promoting effect. Favorable irrigation water quantity also enhanced photosynthesis rate, evaportranspiration rate and stomatal conductance in leaves. It was found that total irrigation amount at 155 L per plant in the whole growing period was best to improve tobacco plant growth and accumulation of dry matter yield, providing an irrigating water recommendation for tobacco production in field.