Jiaozhou Chinese cabbage, referred to as "Jiaobai", is rich in nutritional value and is the top grade of Chinese cabbage. It has been cultivated for nearly a thousand years. It has the characteristics of "tender and thin, milky soup, sweet taste, less fiber, high nutrition, refreshing raw food, poor hot food taste, storage resistance and easy preservation", and is a famous local specialty in China. "Gum white" has a long history of cultivation, which was planted as early as the Tang Dynasty. During the Song and Yuan Dynasties, it was sold in large quantities to Jiangsu, Zhejiang and other places, and it began to be exported overseas in the Ming Dynasty, enjoying a high reputation at home and abroad. 1875, JIAOZHOU Chinese cabbage was exhibited at the Tokyo World Expo, and it became famous all over the world. Fan Chengda, a poet in the Song Dynasty, once wrote a poem in "Pastoral Miscellaneous Xing", "You must taste the honey lotus root when you pull out the snow." The fermented grains here are "the king of all kinds of vegetables" Chinese cabbage. Mr. Lu Xun, a master of Chinese studies, once praised "plastic white" in the article "Mr. Fujino": Chinese cabbage was transported to Zhejiang, tied with red rope and hung upside down in a fruit shop as a "plastic dish". 200 1 was recognized as green food by the National Green Food Development Center, and was also recognized as an excellent product and famous brand product of China Agricultural Expo by the Ministry of Agriculture.

1. In view of the problems of bolting, summer rot, diseases and serious pests in rubber white spring cultivation, on the basis of summing up other people's experience and combining with local actual conditions, the cultivation techniques are as follows: Chinese cabbage is widely cultivated in China, but it is easy to bolting, summer rot, diseases and serious pests in spring cultivation. In order to solve these problems, on the basis of summing up the experience of others and combining with the local actual situation, the cultivation techniques are introduced as follows:

1. Select the appropriate variety and sowing date. Choose South Korea's "King of Spring and Summer" Chinese cabbage variety. This variety is not sensitive to low temperature and premature bolting. Based on the investigation of the actual growth situation in the field before and after April 10 and around April 20, sowing after 1 month and direct seeding in the first open field in May, it was found that few plants bolting except cold bed seedling on April 8 and sowing in May 10.

2. Determine the suitable seedling age. Chinese cabbage leaf bulbs are generally composed of 35-70 leaves. When 8 true leaves are unfolded, the differentiation of these leaf primordia is completed. It takes about 1 month for 8 true leaves to unfold in spring. If the seedling stage is too long, the survival rate of planting in the field will decrease; If the leaf transplantation is insufficient, it will affect the differentiation of leaf buds, leading to the premature formation of flower buds and bolting. According to the sampling survey of 30 plants, the number of leaves of "Chunxiawang" variety is between 48 and 59. This not only avoids the decline of survival rate caused by too long seedling period, but also avoids the influence of too short seedling period on the number of fully differentiated leaves.

3. Strengthen on-site management. The field management of spring-sown Chinese cabbage is different from autumn cultivation, and the whole process emphasizes that the word "Bao" (1) should be "fat", "warm", "fine" and "loose". Use 2/3 non-Cruciferae garden soil,13 decomposed manure, and add 0. The formula of 2% diammonium nutrient soil, sieving and bed loading laid a good foundation for cultivating strong seedlings. (2) When planting, all plants are covered with plastic film. Apply 4000 kg farmyard manure per mu, diammonium 15 kg, and the row spacing is 0. 5×0。 4 meters. (3) After planting water, immediately water the seedlings when the ground is wet and dry, and do not squat the seedlings during the whole growth process. Keep the fields moist and dry. After planting 1 month, topdressing urea 1 time, per mu10-15kg.

4. Pest control. According to the investigation of this experiment, soft rot only occurred slightly in the first stage (seedling raising on April 8, sowing in May 10), and hardly occurred in the second and third stages. Spraying streptomycin 1.50 mg/kg for control. The incidence of downy mildew showed a trend of heavy before and light after. Use 600-800 times of mancozeb solution or 400 times of propargite solution for prevention and control.

5, timely harvest

2. Introduction of Jiaobai 6 Chinese Cabbage

Jiaobai 6 is a new summer cabbage variety with extremely early maturity and heat resistance, which was bred by Qingdao Jiaozhou Chinese Cabbage Research Institute. This variety has been widely planted in China, with strong adaptability and stress resistance. In 2000, it won the gold medal in Qingdao New Variety Exhibition Review Meeting, and in 2002, it was approved by Beijing Crop Variety Approval Committee.

1, characteristics

This variety has strong heat resistance, moisture resistance and disease resistance. The growth period is 50d (5-7d earlier than that of xia yang 302). Generally, the plant height is 33cm, the plant width is 45cm, the plant type is compact, the leaves are dark green, the petiole is white, nearly spherical, the appearance is beautiful, it is resistant to storage and transportation, and the quality and flavor are good. The output per 667 square meters is generally 5000-6000kg, and the pelletizing speed is fast. It can resist high temperature of 38-40℃, high antiviral disease, downy mildew and soft rot.

2. Cultivation points

Shandong can sow from early June to early September (earlier than xia yang 302 10d or so), and other areas adjust the sowing date according to the climate in Shandong. Generally, the row spacing is 50cm, the plant spacing is 40cm, and about 3000-3500 plants are planted every 667 square meters.

Prepare the soil and apply sufficient base fertilizer, and apply 4000-5000 kg of fully decomposed organic fertilizer and 30 kg of compound fertilizer to 667 square meters. Ridge planting and direct seeding (ridge height is about 12- 15 cm).

Small water should be poured frequently in the early stage, and urea 15kg should be applied to the top of 667 square meters before heading, and fertilizer and water should be attacked together to promote it to the end.

Pests mainly include aphids and cabbage worms. , should be timely selection of high efficiency and low toxicity pesticides for prevention and control. When watering, it is not advisable to flood with water to prevent soft rot. If it happens, it can be controlled with 200 mg/kg agricultural streptomycin or neophytomycin at the initial stage of the disease.

Finally, pay attention to timely harvesting to avoid excessive impact on commodity value due to maturity.