Breeding For Heading Chinese Cabbage Zheng Zao58 In Early And Heat Toleranece Selection

The introduction of fine varieties in a wide range of resources at home and abroad, based on the conducted heat, precocious selection of materials innovation and research on early-maturing, heat-resistant materials, screening and identification methods, techniques and new seed varieties and cultivation techniques were discussed to promote , breeding early maturing, heat-resistant Chinese cabbage breeding 9504-1 and 9501-9, and breeding out of early-maturing, heat-resistant new varieties of Chinese cabbage "Zhengzao 58."1, Through the use of batches planting, artificial climate chamber of generation, heat resistance, disease resistance, high temperature cabbage selection and excellent strains of Late Sowing seed technologies combined with a heat-resistant cabbage breeding material screening innovative research, to solve the local heat-resistant Chinese cabbage seed selection the key to technical problems.2, Heat-bred breeding material 9504-1 and 9501-9 early-maturing, high-temperature cabbage is good, disease-resistant, with good adhesion. Which various indicators have reached heat-resistant breeding material requirements, in order to hand over research group of heat-resistant Chinese cabbage breeding programs.3,'Zhengzao 58'growth period 56-60 days, plant growth and tidy consensus seedling green outer leaves, leaves very little hair, knot the ball real tight, green and white to help, leaves the ball stacked hold, short-column type, plant type semi-erect, suitable for close planting, spherical index of 1.61, commodity character is good, Ma Fang tidy, suitable for long-distance transport, high and stable yield, plant weight 2.7 ~ 3.2kg, clean vegetable rate 73%, 667 m2 of clean vegetable production around 4200-5800kg. Quality, soft, taste good, food taste good. Wide adaptability and can be used for early summer, summer and early autumn planting. In 2005 by the Beijing Academy of Agriculture and Forestry Plant Protection Environmental Protection, identified as early as'Zhengzao 58'high resistance to virus disease and black rot, downy mildew resistance.4, Years of variety test and extend the trial showed that:'Zheng zao 58'early-maturing, disease resistance, good quality, suitable sowing a long period, mainly for the summer, early autumn cultivation. After years of introduction and demonstration planting, they are wide adaptability, suitable for Henan, Hebei, Shandong, Beijing, Anhui, Hubei, Shanxi, Shaanxi, Yunnan, Jiangsu and other places grow. High yield, plant efficiency is good, with good promotion prospects.