| Abstract: In summer and autumn, loose-curd cauliflower has a large planting area in Xiaoshan district, and there are many cultivars of loose-curd cauliflower on the seed market. The phenomenons of early flower, small flower, wool flower and deformed flower affected seriously the yield and quality of loosecurd cauliflower. Therefore, the suitable sowing date and density screening test of cultivar 'Qiuyu 70-day' with good performance in the screening test of 2017 was carried out. At the same time, 8 cultivars were introduced and compared with the conventional cultivar 'Changsheng 65-day F1' to screen more excellent cultivar. The results showed that 'Qiuyu 70-day' loose-curd cauliflower sown in late July showed high quality of single bulb, low incidence of black spot and high yield. It was suitable to plant 2 200 plants per 667 m2. The weight of single bulb was high. Although the incidence was slightly high, it did not affect the yield. The head trait of 'Mingzhu 65-day' was white, beautiful, with low incidence and high yield, which was worthy of demonstration and popularization. |