中国油料作物学报2024，Vol.46Issue(2)：334-340,7.DOI:10.19802/j.issn.1007-9084.2022283
油菜对超高密度直播的响应与产量构成性状分析
Response and yield components of 54 varieties to high seeding rate planting in rapeseed(Brassica napus L.)
摘要
Abstract
Planting density is one of the most important factors to improve repeseed yield,generally 30×104-45×104 plants/hm2 is recommended in national variety trials and farmer planting in China.However,poor weather and soil conditions will affect the emergence of rape seedlings.For a long time,rape farmers have formed the sowing habit of greatly increasing the sowing amount,for example,the sowing amount of farmers in Hubei,Hunan and Jiangxi reaches 7.5kg/hm2.High seeding rate can produce more than 180×104 plants/hm2.In period of emergence,if current rapeseed varieties can adapt to high seeding rate is unclear.In this study,54 rapeseed varieties planted with 7.5 kg/hm2 seeding rate which simulated farmer's seeding habit.The results showed that a large range genetic variation existed in no-effc-tive plant density,plant pods,effective plant density and yield.Under high seeding rate,plant height,number of seeds per silique,plant weight and effective plant density were significantly correlated with yield.Compared to the low-yield type varieties,high-yield type varieties increased 67.6%in yield.Multivariate correlation analysis showed that effec-tive plant density,seed number per silique and plant dry weight had a significant relationship with yield,effective plant density had the largest path coefficient on yield(0.6849),followed by plant dry weight,plant height,seed num-ber per silique and seed weight.Different varieties could form different effective plant density,70×104-120×104 plants/hm2 effective plant density ranges would produce higher seed yield.In order to adapt to the high seeding rate,we should select suitable varieties with higher seeding rate field trial.For genetic improving and variety breeding,we should focus on the same traits such as strong forming ability of effective plant density,seed and pod number,which re-lated to early vigor,plant dry weight,seed number per silique,seed weight.关键词
油菜/密度/播种量/产量/回归分析/通径分析Key words
rapeseed/plant density/high seeding rate/yield/regression analysis/path analysis分类
农业科技引用本文复制引用
贺继奎,程勇,何泽威,丁晓雨,叶鹏,许本波,徐劲松,张学昆..油菜对超高密度直播的响应与产量构成性状分析[J].中国油料作物学报,2024,46(2):334-340,7.基金项目
湖北省"515"行动(协同推广)"油菜新技术示范科技服务油菜产业链项目" （协同推广）
农业农村部种植业管理司"油菜产业政策调研及主要病虫害防治策略"(15214011) （15214011）
