Abstract: In order to explore the effects of topdressing organic-inorganic compound fertilizer on the yield and quality of flowering Chinese cabbage and rapeseed, the main rape varieties Huayouza 62 (C₁), Zhongyouza 501 (C₂) and Zhongyouza 19 (C₃) in Hubei Province were used as the research objects, and three topdressing treatments of organic-inorganic compound fertilizer [0 (Z₁, no topdressing), 225 kg/hm; ² (Z₂), 450 kg/hm; ² (Z₃)] were set up. The effects of topdressing organic-inorganic compound fertilizer on the yield and quality of flowering Chinese cabbage and rapeseed were studied. The results showed that the yield of flowering Chinese cabbage and rapeseed with topdressing organic-inorganic compound fertilizer was significantly higher than that without topdressing. Among them, except for the yield of flowering Chinese cabbage of Zhongyouza 501 and Zhongyouza 19, there was no significant difference in the yield of flowering Chinese cabbage and rapeseed between the topdressing amount of 450 kg/hm; ² and the topdressing amount of 225 kg/hm; ². Compared with no topdressing, the soluble sugar content, sucrose content and vitamin C content of flowering Chinese cabbage increased after topdressing organic-inorganic compound fertilizer. With the increase of topdressing amount, the contents of vitamin E and amino acids in flowering Chinese cabbage increased first and then decreased. After topdressing organic-inorganic compound fertilizer, the protein content and erucic acid content in rapeseed decreased, and the oil content, glucosinolate content and oleic acid content increased. Considering the yield and quality indexes of flowering Chinese cabbage and rapeseed, the optimum topdressing amount of organic-inorganic compound fertilizer for three kinds of oil-vegetable double usage type rape was 225 kg/hm; ².

Key words: oil-vegetable double usage type rape, flowering Chinese cabbage, rapeseed, organic-inorganic compound fertilizers, topdressing amount, yield, quality