Current Situation of Breeding and Popularization of Short-Growth-Period Winter Rapeseed Varieties for Rice-Rice-Rapeseed Mode
The self-sufficiency rate of edible vegetable oil is less than 31 percent in China,with a high degree of import dependence.Rapeseed is the only winter oilseed crop with a wide range of suitable planting region,and it is an important source of edible vegetable oil in China.Planting more rapeseed is an important measure to guarantee national edible oil supply security.Making full use of the winter fields in the southern double cropping rice area to promote"rice-rice-rapeseed"production is an important approach to expand the planting area of rapeseed.The area suitable for the"rice-rice-rapeseed"production mode is mainly distributed in the double cropping rice area of Hunan,Jiangxi,Guangxi and Hubei provinces in China,with a potential area of about 1.87 million hm2.According to the conditions of temperature and light resources,three suitable areas for the"rice-rice-rapeseed"production include the ample area,tightly balanced area and the constrained area.All the areas require early-maturing rapeseed varieties with a growth period of around 180 days,which are suitable for being sown in mid-to late October and harvested in mid-to late April.Among a total of 75 new rapeseed lines participated in the early-maturity group of the national rapeseed variety trials from 2013 to 2022,the average growth period ranged from 169.3 to 185.5 days,and the average yield was 1 635.90-2 228.55 kg·hm-2,with 22 varieties out yielded the check variety.There are 72 early-maturing winter oilseed rape varieties with a growth period less than 190 days were registered by the end of May 2023.These varieties are suitable to be used in the"rice-rice-rapeseed"mode,and most of them are hybrid varieties with low erucic acid and low glucosinolate quality.11 varieties,Yangguang 131,Fengyou 730,Fengyou 320,Fengyou 847,Ganyouza 906,Shengguang 127,Xiangyou 420,Jingyou 69,Fengyou 112,Huayouza 652,Ganyouza 1009,are the most promoted and applied early-maturing winter rapeseed varieties in the"rice-rice-rapeseed"production area,with more than 135 hm2 each in 2022.The present varieties can basically meet the early-maturation demand in the ample area.In the tightly balanced and constraint areas,however,the growth period of these varieties is too long.To expand the production and efficiency of rapeseed industry,it is urgently needed to strengthen the policy and financial security in the future,carry out joint breeding projects for short-growth-period winter rapeseed varieties to further improve the yield in the ample area and shorten the growth period in the tightly balanced and constrained areas.Meanwhile,to strengthen the research and promotion of supporting cultivation technology for elite varieties,match well early rice,late rice,and rapeseed varieties are also good measures to support the expansion of rapeseed production in the"rice-rice-rapeseed"production area.In addition,improving agricultural socialized services,expanding agricultural insurance and increasing subsidies for rapeseed planting to ensure production benefit will enhance the farmers'enthusiasm for the"rice-rice-rapeseed"production.
rice-rice-rapeseed modeshort-growth-periodwinter rapeseedbreeding and popularization
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