The Research On The Technology Of High-Yield Cultivation And Seed Production Of The Middle-Late Matured New Variety With Black-Rot Resistance Of Shenglv Erhao Of Broccoli

The Black-rot resistant hybrid J9806B58-4xB68 with fine integrated traits was produced by the utilization of self-cross sterile lines and back-cross. The hybrid has been identified by Shanghai Identification Committee for New Varieties of Crops, and was given a identified name"Shenglv Erhao". The hybrid is middle-late matured and its growing period varies from 120 days to 130 days in downstream of Yangtze River area. The top head is its main part of the yield, and its shape looks like high round. The average weightiness per head is 450-500g.The bud is very small ,.uniform and arranged tightly. The flowering branch is short. It's steak is enrich without empty heart. The hybrid is strong resistant to black-rot disease. Compared with the main variety "Shenglv" ,imported from Japan, Shenglv Erhao grows stronger, matures three-days earlier, and the end harvest time is almost the same . The average weightiness per head of Shenglv Erhao is 494g, that is 4.6% heavier than Shenglv. It's average yield gets 9101 kg/667m2, that is 8.7% higher than Shenglv. It's commercial rate gets 81.3%, that is the same as Shenglv. Five demonstrating fields of 15hm2 was established in Zhejiang, Shanghai and other districts. 66hm22 demonstrating land for exporting was established in Jinshan district, Shanghai. 2000hm2 has been popularized to use the hybrid Shenglv Erhao in broccoli cultivation within 2002-2006. The production value gets 45 million Yuan and increased production value gets 5 million Yuan. When the seeds of hybrid of Shenglv Erhao is to be produced, in order to guarantee flowering time of the male parents and female parents to meet, the suitable sowing time of female parent is from 27,Aug to 1,Sep. Sowing time of male parents is recommended delay for 25 days to one month. The optimum ratio of male and female parent should be 1:1. When Shenglv Erhao is utilized to broccoli production, The best sowing date is suggested from 31,July to 20,August. Within this period, earlier sowed, more yield. The hybrid is tolerant to thin field, and Sensitive to over fertilizer. When fertilizer is reduced by 20%, the average weightiness per head and yield per area will not reduce. The optimum density should be 2200/667m2 When tray seedlings were applied, the yield and the quality were better than that seedlings grew from soil were used, and the harvest time is 4 days earlier.Four technology protocol has been established through researching and summarizing. That includes parents propagation, the production of the seeds of the hybrid, the production of the tray seedlings and the cultivation with high yield and profits. All these have laid solid foundation to extension and utilization for hybrid Shenglv Erhao. The breeding of hybrid Shenglv Erhao with black rot resistant and for exported cultivation, will not also increase self-supply rate and commercial rate significantly, but also increase competitive capacity of the products of broccoli in China. It will play a very important role in promoting the development of the seed agriculture in Shanghai, and in improving self-innovation capacity in agricultural enterprise.