The Effect of Light Interception and Light Use Efficiency with Different Sowing Time of Faba Bean (Vicia Faba L.)

Abstract

In this study, it was aimed to define the effect of light interception and light use efficiency with different sowing time of faba bean (Vicia faba L.). Model equation produced for light use efficiency parameters were derived as affected by light intensity and temperature. As a result of multi-regression analysis, it was found that there was close relationship between light intensity and temperature predicted light use efficiency. The light use efficiency model developed was LUE = 6.39 – (8.93E-03 x L) – [1.7E-05 x(T² x L)] + [1.49E-07 x (T x L²)] + [4.69E-04 x (T x L)] where LUE is light use efficiency, L is light intensity, T is temperature. R2
value (0.83) and standard error were found to be significant at the p<0.01 level. Radiation cut by canopy depends on the structure of canopy and is defined as light interception. When the temperature reaches 16°C and the amount of light interception is 2000 µmolm-2s-1, light usage efficiency reaches the highest level on faba bean. In the cases on which the amount of light interception is 337.35 µmolm-2s-1 and the temperature is low (9°C) light interception is 30%. When the amount of light interception is 817.54 µmolm-2s-1 and the temperatures are 15°C, 18°C, 22°C, and 25°C light interception is 50% and when the amount of light interception is 1128.39 µmolm-2s-1 and the temperature is 30°C–31°C, light interception is in the value of 90%.