Cabbage (Brassica oleracea var. capitata L.) grown under the conditions of the life cycle of winter oilseed rape (Brassica napus L.) in order to achieve a stable seed yield

The expression of genes that induce the transformation of meristems into the reproductive stage in oilseed rape is realized in conditions of low positive temperatures for a certain period of time. Such a flowering process is called the vernalization pathway. A four-factor field trial with 6 genotypes of head cabbage was set up at the Institute of Vegetable Crops in Smederevska Palanka, of which three parental genotypes were divergent by geographical origin: Scc, B and N, and three more F1 hybrids were selected by diallel crossing: Scc x B, Scc x N and B x N. In order to achieve a different vegetative stage, seedlings were sown at three sowing dates: August 15th, September 1st and September 15th. Transplanting was done on October 20th. The results of sowing head cabbage within the sowing period for oilseed rape were the induction of the flower mechanism, the absence of the head formation phenophase, and the realization of a stable seed yield. The experiment was performed in vivo in the control version and in the treatment with gibberellic acid - GA3. The influence of all four factors: season, genotype, sowing date and GA3 treatment showed statistical significance for the yield components as well as for the yield itself and seed quality. The three seasons in which the experiment was evaluated differed in temperature during overwintering: 2010/2011 was moderately cold, 2011/2012 was extremely cold, while 2012/2013 was warm. In the cold season, the seed yield was low, and reduced to the biological maintenance of the species, while the highest seed yield was achieved in the third - warm (2012/2013) season in the first sowing period. The experiment also confirmed the existence of an identical flower mechanism in the species Brassica napus L. and Brassica oleracea var. capitata L.