Abstract: In order to study the technology of reducing fertilizer and increasing efficiency suitable for the production of broccoli(Brassica oleracea var. italica) and improve planting efficiency, five treatments were set up: No fertilization(CK), conventional fertilization(FFP), optimized fertilization(OPT), organic substitution fertilization(OPT-1), organic substitution + water-soluble fertilizer topdressing(OPT-2). The effects of different fertilization modes on biological traits, yield, partial factor productivity of fertilizer, quality, dry matter and nutrient accumulation of broccoli were studied. The results showed that there was no significant difference in the yield, dry matter, N and P₂O₅ accumulation between organic substitution + water-soluble fertilizer topdressing and conventional fertilization. The partial factor productivity of fertilizer, vitamin C, soluble sugar, soluble protein and K₂O accumulation were significantly higher than those of conventional fertilization(P<0.05), and the chlorophyll content and nitrate content were significantly lower than those of conventional fertilization(P<0.05). When planting broccoli, it was suggested that the fertilization mode should adopt organic substitution + water-soluble fertilizer topdressing to ensure the yield of broccoli and improve its quality.

Key words: fertilizer reduction and efficiency increase, broccoli(Brassica oleracea var. italica), organic fertilizer replacement, water-soluble fertilizer topdressing, yield, vegetable quality