The effects of different sowing dates on organic broccoli (Brassica oleracea var. italica L.) seed yield and quality
Broccoli like other crucifers is affected by ecological conditions during seed production periods. In this study, seed yield and quality parameters of open pollinated broccoli 'Turaç 77' were studied at different sowing dates (January, February, June and September) under organic production conditions. The trial was designed in complete randomized blocks with four replications in each sowing date. Organically certificated plant nutrients/fertilizers and organically certificated pesticides were used during the field trial. Accordingly, the organic seed production was certificated for all trials. Seed yield (kg ha-1), 1000 seed weight (g), number of seeds per gram and germination rate (%) were the parameters compared at four different sowing dates. The results indicated that the highest broccoli seed yield was achieved in September with 999.38 kg ha-1, followed by February with 470.18 kg ha-1. January and June sowing dates were determined as unsuitable for broccoli seed production. The comparison of the parameters indicated that sowing date affected number of seeds per gram, whereas no effect on 1000 seed weight . Number of seeds per gram was 306.6 in September sowing date, followed by 289.7 in January, and 257.3 in February. Germination rate was 100% for all sowing dates.
Beşirli, G., Sönmez, İ., Albayrak, B., Polat, Z. and Tatar, İ. (2020). The effects of different sowing dates on organic broccoli (Brassica oleracea var. italica L.) seed yield and quality. Acta Hortic. 1286, 23-28
certification, nutrient management, pests, sowing date, Trichoderma harzianum