| The oilseed rape is the main oil crops in China. The yearly average planting acreage of rapeseed is 7.34million hectares, which is second highest in the world, and the total production has been 13 million tons, ranks first in the world. The oilseed rape is also an important source of edible vegetable oil, protein feed and raw materials of industry. It is the first choice of multiple crop rotation with rice and corn in agriculture and pioneer crop for improving soil fertility. The rapeseed production in China has been increased steadily by breeding and improving cultivation techniques.In China, the variety and type in oil rape is rich and varied. It include:B mapus, B campestris, B juncea, B nigra, B oleracea, B carinata, Today the leading variety of oil rape cultured is B napus.Hunan is rice-rice-rape triple-cropping region. It have to plant earling-maturity of rape.The experimants were conducted to study the feasibility of using variety of B. chinensis.The main results are shown in the following:The variety expression of B. chimensis the growth period about 180 days, siliqua/plant more than 200, yield/666.7m2 about 150 kg, It have TUMVã€stem rot resistant. At present the key problems for using early mature variety of B. chimensis sheuld be solver are:Selection variety of TuMV and stem rot resistant; double low, high oil content. Varietys of more than100 kg/666.7m2 yield in the study have four:Chanshatubaicai,Nonda biaobenyanyoucai, Linlibaicaixin,Chanshayouba-icai the growth period of the four species were 186,188,186,188 days; agronomic traits to Chanshatubaicai,Nonda biaobenyanyoucai, Linlibaicaixin,,160cm or more. Number of branches per plant was 4.0-6.3 months degree of convergence to a maximum of Chanshatubaicai. The number of pods per plant margin of 201.3-278.3 months, Chanshatubaicai most. Grain weight amplitude of 2.1-3.0g, Changsha grain weight heavier soil cabbage; production amounted to:176.6667,143.3333,143.3333,123.3333 kg. |
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