Photosynthesis parameters of oil crops (Brassicaceae family)

The results of studying the parameters of photosynthetic activity of oilseeds (false flax, Abyssinian crumbe and white mustard) are presented. So, in the phase of the rosette, the assimilation surface was 11.2-21.8 thousand m2 per hectare. The smallest leaf area of  11.2 thousand m2 per hectare  was formed in the Abyssinian crambe agrocenosis. During the budding phase, the leaf area of  the crambe doubled and amounted to 22.3 thousand m2 per hectare. The leaf surface of all studied oilseeds reaches its maximum value in the flowering phase - 42.4-52.1 thousand m2 per hectare. In white mustard, the minimum leaf area was in the rosette phase - 21.8 thousand m2 per hectare, the maximum - in the flowering phase - 44.2 thousand m2 per hectare. Then the total assimilation surface decreased by 29.5% and amounted to 31.2 thousand m2 per hectare. The value of photosynthetic potential   ranged from 1594 to 1964 thousand m2 × day per hectare. The maximum value of photosynthetic potential was in Abyssinian crambe - 1964 thousand m2 × day per hectare, the minimum one - in false flax - 1594 thousand m2 × day per hectare. The high productivity of photosynthesis was in Abyssinian crambe (2.52 g / m2 × day). White mustard and false flax are characterized by slightly lower parameters of the net productivity of photosynthesis - 2.07 and 1.98 g / m2 × day, respectively. A longer period of the assimilation surface of false flax, white mustard and Abyssinian crambe plants provides high net photosynthesis productivity - 1.98-2.52 g / m2 × day and, as a result, high potential productivity up to 2.11-3.05 t / ha.