Abstract:

Abstract：In order to reveal the effects on foliar fertilizer to photosynthetic rate, and increase the photosynthetic productivity of tobacco, we researched and analyzed the response characteristics of photosynthetic rate, transpiration rate, stomatal conductance and water use efficiency to light intensity during the fast-growing period. It indicated under application foliar fertilizer conditions, photosynthetic rate, transpiration rate, stomatal conductance all gradually increased with the light intensity enhancement. Under no application foliar fertilizer condition, transpiration rate and stomatal conductance gradually increased with the light intensity enhancement. Yet, when light intensity exceeded 1200μmol s-1m-2, it appeared photons saturation. Photosynthetic rate, transpiration rate, stomatal conductance under application foliar fertilizer conditions were higher than those under no application, but water use efficiency was no change. So, application foliar fertilizer would remarkably improve photosynthesis and leaf gas exchange of the tobacco.