Cultivation techniques of Brassica oleracea L.

1) Variety and cultivation season.

A variety.

Medium ruffled cabbage: suitable for spring and autumn cultivation, 80 days after planting harvest, spherical, outer leaves dark green, leaf ball milk yellow, single ball weight 1.6 kg, cold resistance, rich in vitamins, can be eaten raw or salad.

Promasa: suitable for planting in spring and autumn, harvested 85 days after planting, dark gray green leaves, green spherical leaves, light yellow green, single ball weight 1.8 kg.

2. Cultivation season. To spring and autumn two seasons of open-field culture-based.

Spring cultivation: greenhouse seedling, sowing in January to February, planting in mid-March to April, harvesting in mid-June.

Autumn cultivation: open field seedling, sowing in mid-late June, planting in mid-late July, harvesting in mid-late October.

2) Key points of cultivation techniques

① Seedling. In spring cultivation, greenhouse seedlings are used, and seeds are sown in January to February; in autumn cultivation, seeds are sown in the middle and late June, and plots with good ventilation, drainage and irrigation are selected, and seedlings are sown in a shed to prevent heat and rain. Seedling method is the same as purple cabbage. Two leaves and one heart are divided into seedlings, and 5 - 6 leaves are ready for planting. 2. Planting. Before planting, soil preparation: apply 22500 kg of decomposed compost per hectare as base fertilizer, make beds on the flat ground, the width of the beds is 1.0~1.1 meters, double row planting, the plant spacing is 40~50 cm ×50~55 cm. Spring planting in late March to early April, autumn planting in late July. When planting seedlings should not be deep, soil surface and ridge surface shall be flat, timely watering after planting.

③ Field management. After planting 5~7 days, irrigate once, loosen soil when soil surface is slightly dry, then according to weather conditions and seedling conditions, timely irrigate, always keep soil dry and wet, and tilling and loosening soil in time after each watering. After the seedling is slowed down, topdressing is applied with watering, and urea 150 kg, ammonium sulfate 300 kg, or ammonium bicarbonate 300~375 kg per hectare; the second fertilizer is applied in the rosette stage, and nitrogen, phosphorus and potassium compound fertilizer 225 kg per hectare is applied; the third fertilizer is applied in the ball setting stage, and nitrogen, phosphorus and potassium compound fertilizer 330 kg is applied per hectare.