Screening of Rice and Rapeseed Varieties Suitable for Triple Cropping System in Southern Hunan
In order to select rice and rape varieties suitable for"oil-rice-rice"triple cropping system in Southern Hu-nan.Using 2 early-maturing early rice varieties(Zhongzao 39,Zhuliangyou 819),8 high-quality late rice varieties(Shengtaiyou 9712,Ruiliangyou 1053,Taiyou 398,Taoyou 919,Taoyou Xiangzhan,Taiyou 390,Longjingyou No.1,Wuyou Tizhan)and 6 early-maturing rape varieties(Xiangyou 420,Yangguang 131,Fengyou 112,Xiangyou 228,Changzaoshu No.1 and Changzaoshu No.2),a variety screening experiment was carried out in Hengyang,Hunan Province in 2022.The results showed that in the early rice season,the growth period of Zhongzao 39 was 113 d and the yield was 7.98 t/hm2.The growth period of Zhuliangyou 819 was 112 d and the yield was 8.42 t/hm2,which was 5.51%higher than that of Zhongzao 39,and the difference was significant.In late rice season,the growth periods of Taoyou 919,Taoyou Xiangzhan,Taiyou 390,Longjingyou NO.1 and Wuyou Tizhan were all longer than 112 d,which were not suitable to be used as"oil-rice-rice"tri-ple cropping varieties,and the whole growth periods of Shengtaiyou 9712,Ruiliangyou 1053 and Taiyou 398 were 108 d,106 d and 105 d,respectively,and their yields exceeded 7.04 t/hm2.The rape variety Qianyou 112 has the longest growth period and matures on May 1st,and its yield is lower.Xiangyou 420 has the earliest ripening stage and matures on April 22nd,and its yield is the lowest,which is significantly lower than that of other varieties.Yangguang 131 has the highest yield,which is significantly higher than other varieties,but it has a long growth period and matured on April 29th,so it has a certain risk as a triple cropping system.Xiangyou 228,Changzaoshu No.1 and Changzaoshu No.2 could mature before April 26th,and their yield was higher than that of 1.80 t/hm2 and significantly higher than that of Xiangyou 420 and Chang-you 112.To sum up,the early rice varieties suitable for"oil-rice-rice"triple cropping system are Zhuliangyou 819,the late rice varieties are Shengtaiyou 9712,Ruiliangyou 1053 and Taiyou 398,and the rape varieties are Xiangyou 228,Chang-zaoshu No.1 and Changzaoshu No.2.under the conditions of transplanting of early and late rice seedlings and direct see-ding of rape,the growth period of rice and rape is suitable,and the yield is higher,so it is suitable to popularize.
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