Abstract: In order to find out the application effect and suitable application amount of fertilizer on green manure, six different fertilization treatments were set up to study the effects of different fertilization dosages on the phenological period, winter solstice and biomass of green manure rapeseed. The results showed that fertilization not only prolonged the growth period of green manure and improved winter solstice, but also had a certain effect on improving the biomass of green manure. Compared with the treatment without fertilization (T₁), the growth period of green-fertilized rapeseed treated with fertilization (T₂ to T₆) was delayed by 2~5 days, and the plant heightincreased by 6.3~9.7 cm, rhizome thicknessincreased by 4.7~5.0 mm, leaf number per plant increased by 1.7~2.8 tablets,and leaf area of winter saplings increased by 21.1~41.3 cm²; Compared with T₁, the biomass fresh weight of vegetated vegetable moss increased by 14 775~31 410, 16 290~33 585 kg/hm², and dry weight of vegetated vegetable moss increased by 9 300~21 990 and 10 140~24 345 kg/hm² respectively at the mature stage and in the fertilized vegetable moss stage. The optimal fertilizer rate of green rape in Wuxue city was N 75 kg/hm², P₂O₅ 30 kg/hm² and K₂O 45 kg/hm².

Key words: fertilizer application rate, green manure rapeseed (Brassica napus L.), biomass