Shape: The flowers are bisexual, with 4 petals arranged in a cross. Stamens are usually 6, 4 long and 2 short, which are often called "four strong stamens". The pistil consists of two carpels, and the ovary is at the top. Stems cylindrical, much branched; Leaves alternate, large, dark green, without petioles and stipules. In March and April, there are flowers at the top of the stem, racemes, four calyxes, yellow-green, four corollas, yellow and a cross.

Rape flower, alias Brassica, Latin name rape, native to Europe and Central Asia, is a Brassicaceae plant. In China, it is concentrated in Huangling in Wuyuan, Jiangxi, 10,000 mu terraces in Hanzhong Basin and Jiangling, Luoping Plain in Yunnan and Menyuan Plateau in Qinghai.

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After the 1970s, China has done a lot of research work on the utilization of heterosis in rapeseed, and found the Polima cytoplasmic male sterile line with practical value for the first time in the world, and realized the three-line matching for the first time. By studying the methods of cytoplasmic male sterility, nuclear male sterility, self-incompatibility, chemical emasculation, natural hybridization, parthenogenesis and radiation breeding, a number of new rapeseed varieties, such as Glycerol No.5 and You Xiang No.5, which play an important role in production, have been selected.

Spraying 1 time aqueous solution of trace elements such as phosphorus, boron and manganese or compound organic fertilizer at the flowering stage of rape can prevent rape from flowering and bearing no fruit. Spraying 0.02% boric acid solution on leaves can increase the number of effective branches, pod number per plant and 1000-grain weight of rape. Spraying 2% ~ 3% aqueous solution of calcium superphosphate on the pod leaves at maturity.

References:

Rape flower-Baidu encyclopedia