Abstract:

The aims of this study were to study the changes of yield and plant traits of conventional rape and hybrid rape under different seeding amounts, and determine the optimum sowing amount of conventional rapeseed and hybrid rapeseed. Using 6 rape varieties as materials, 7 treatments were set up with different sowing amount. The relationships between seeding amount and the number of adult plants, yield and plant character were analyzed. The results showed that, seeding amount had significant effect on the number and yield of adult plants, the number of adult rapeseed plants increased with the increase of sowing amount, and the yield increased first and then decreased. The yield of conventional and hybrid rapeseed was the highest under B₂ treatment (3.0 kg/hm²), which was 2569.51 kg/hm² and 2874.86 kg/hm² respectively. The yields of the two were similar in B₆ treatment, with an average yield of 2418.25 kg/hm². There was a significant positive correlation between conventional rapeseed yield and number per pod (0.6871^**), and there was a highly significant positive correlation between the yield of hybrid rapeseed and the length of the main inflorescence (0.6275^**). Rapeseed quality was mainly determined by variety characteristics, and had nothing to do with sowing quantity. Under the conditions of this experiment, the optimum sowing amount for high yield of direct sowing rape was 3.00 kg/hm².

Key words: sowing rate, the number of adult plants, hybrid rape, conventional rape, yield