苏南丘陵地区不同播期及定植期对黄皮洋葱生长的影响OA

The study aims to solve the problem of lack of supporting autumn and winter cultivation techniques for the new variety'Nonglin Huangyu 405'yellow onion in the hilly areas of southern Jiangsu,and the unclear sowing and planting periods.To select the suitable cultivation date,two sowing periods(September 27th and October 11th)and three planting periods(November 29th,December 13th,and December 27th)were set up,resulting in six treatments.Plant growth traits,seedling biomass,bulb traits,and yield were measured to select the optimal combination.The results showed:(1)After 60 days of planting,seedlings planted earlier showed better growth vigor.With the postponement of sowing and planting periods,the total dry and fresh weight of the whole plant and the healthy seedling index showed an upward trend during the seedling stage.(2)The treatment of sowing on October 11th and planting on November 29th(T2)performed the best,with a bulb length of 8.62 cm,width of 10.20 cm,hardness of 7.30 kg/cm2,and a single bulb weight of 386.67 g,equivalent to a yield of 86445.33 kg/hm2,which was 2.83%-50.09%higher than other treatments.(3)Postponing the sowing and planting periods led to a decrease in bulb traits and yield.In summary,sowing on October 11th and planting on November 29th is the optimal cultivation combination for'Nonglin Huangyu 405'in the hilly areas of southern Jiangsu.In the future,cultivation parameters can be optimized by combining soil fertility and climate year types,and a collaborative experiment on sowing-planting period-density can be conducted to provide more comprehensive technical support for the large-scale promotion of new varieties.