Adaptability Evaluation And Utilization Of Very Early Maturing Kale Type Oilseed Rape In Hainan

In this study,93 oilseed rape varieties(lines)were investigated for their fertility,quality and high-temperature and heat-resistant performance under different cultivation methods in Hainan.The analysis was carried out with the aim of selecting the best performing lines from the pre-selected varieties and laying the foundation for further expansion of the cultivation area and multi-purpose development of new self-bred early maturing kale oilseed rape(Brassica napus L.)varieties(lines).The main results obtained were as follows:(1)Different growing seasons,regions and fertilizer management patterns had significant effects on the fertility period,rapeseed yield and quality of kale type rapeseed.Under the integrated water and fertilizer drip irrigation mode,the fertility period of kale type rapeseed in Dongfang was shorter than that in Haikou,and the yield of rapeseed per plant was higher,ranging from 13.0656 to 25.0178 g.Six materials meet the double-low standard in Haikou and Dongfang,including20N9-314-1,20N9-377-1,21QZ007-4×Pink,Selenium Ziyuan 2,20N9-109-2×052-2and 20N9-314-2.By sowing in different seasons in Haikou and Dongfang,10 new lines and combinations of Hainan summer sowing that can draw and bloom can be adapted to the needs of rapeseed sea arrangements for major festivals in Hainan Province,such as Spring Festival,May Day and National Day.(2)By measuring the quality and yield performance of vegetable-specific oilseed rape varieties selenium Se Zhiyuan NO.1 and NO.2 in different water and fertilizer management patterns and annual sowing in Dongfang and Qionghai,it was found that the quality and yield indexes of the same variety for vegetables varied widely in different regions.Se Zhiyuan NO.2 had earlier shoots than Se Zhiyuan NO.1,and Se Zhiyuan varieties could be planted for three to four crops at a time.Based on the average market price of 4.75 RMB/kg,the production value of one crop of Se Ziyuan NO.1 and NO.2 in the East were 6899.50 RMB/hm~2and 6905.05RMB/hm~2,respectively,and the theoretical total net income economic benefits of three crops of harvested vegetables in Qionghai on December 31,2022 are 25793.73kg/hm~2and 20276.66 kg/hm~2,respectively,The theoretical total net income economic benefit of Se Zhiyuan NO.1 and NO.2 harvested cabbage in Qionghai in December 31,2022 were 25793.73 kg/hm~2and 20276.66 kg/hm~2respectively.(3)From 2021 to 2023,different cropping patterns such as monocropping and intercropping of kale type rape shoots were explored in Hainan University Haidian Campus Agricultural Experimental Base in Haikou,Qionghai Zhongyuan Town,Dongfang Sanjia Town and Chengmai Fushan Town,Hainan Province,respectively,and kale type rape shoots could be either monocropped or intercropped with winter melons and vegetables in Hainan Province to improve land use efficiency and economic benefits.The intercropping with winter squash and vegetables can be sown at a relaxed time and with greater freedom.The sowing time of intercropping with winter melon and fruit vegetables should be earlier than or synchronized with melon and fruit vegetables,and the degree of freedom is smaller.