如何种植管理秋季大白菜（How to plant and manage autumn Chinese cabbage）.doc

如何种植管理秋季大白菜（How to plant and manage autumn Chinese cabbage） Varieties Chinese cabbage is the main edible vegetable in spring and winter, and it is also the main stubble of Chinese cabbage. Therefore, it is important to plant Chinese cabbage in autumn. The main reasons for the high yield of Chinese cabbage are growing season, disastrous weather, serious disease (major virus disease, downy mildew and soft rot disease). Therefore, it is necessary to improve the high and stable yield of Chinese cabbage around the three major diseases. There are many varieties of Chinese cabbage, which can be divided into three basic ecological types: straight barrel type, original head type and oval type. However, due to the growing season, the selection must be resistant to disease, cold, high yield and Storability of late maturing varieties. The main fine varieties are: Lu Bai 3, Shandong 2, Shandong 5, Feng 85, and so on. Two, sowing time In general, in 3 to 5 days after the beginning of autumn sowing advisable, high temperature year can be delayed until mid August. Late maturing varieties with resistance to disease and long growth period can be sowed as early as possible, and medium and mature varieties with short growing period can be sowed several days later. Three. Preparation before sowing Chinese cabbage can not be continuous cropping, nor can it rotate with other cruciferous vegetables, which is one of the important measures to prevent diseases and insect pests. Harvest the crops before, to timely Ripper, combined with the land, can be 8000 ~ 10000 kg Mushi manure, NPK compound fertilizer 75 ~ 100 kg, applied to the basal, leveling. Four, planting technology 1, sowing. Sowing is divided into two types: direct seeding and seedling transplanting, which are usually determined by the harvest of the preceding crop. The front crop can be harvested as early as possible, and the soil can be prepared in time, and the direct seeding method can be adopted. Otherwise, the method of raisin