The rosette stage of cabbage is the most sensitive period of cabbage to fertilizer and water, and it is also the key period to form yield. Therefore, it is necessary to strengthen the fertilizer and field management of cabbage.

One. Scientific top dressing

The requirements of cabbage for fertilizer are mainly nitrogen and potassium, and phosphate fertilizer should be applied appropriately. In the whole production process, the mixing ratio of the three elements is 3:1:4. From the analysis of the growth stage, the seedling stage requires more nitrogen fertilizer, and reaches the peak in the rosette stage. Therefore, it is necessary to topdress in time in the rosette stage to avoid affecting the later stage of the ball. Adequate nitrogen nutrition is particularly important for promoting the formation of large green leaves and improving photosynthetic efficiency. If the supply of phosphorus and potassium is insufficient in the later stage, it is often difficult to form balls. It is recommended to apply 40kg meinongba npk16-6-26 in two strips or holes to ensure that the cabbage grows vigorously, the stalk is thick, the leaves are thick, and the yield is high.

Two. Water management

During the growth process of cabbage, it is necessary to maintain the air permeability of the soil to effectively ensure that the cabbage does not appear drought and flood disasters during the early growth stage. During the rosette stage, the irrigation should be controlled. It is necessary to control a certain amount of soil moisture so that the rosette has a sufficiently large assimilation area, and control the amount of water not to be too much, forcing the internodes of the inner shortening stem to be short, so that the ball can be tight and firm. At the end of the rosette period, water should be refilled. After continuous heavy rain, it is necessary to carry out drainage work immediately, and water accumulation in the cabbage planting area is strictly prohibited. Pay attention to control fertilizer and water 15 days before harvest to facilitate harvesting and storage.

Three, pest control

1 Disease control

In the process of controlling cabbage diseases, the principle of disease-resistant varieties as the mainstay and agricultural control as the supplement should be adhered to. When a disease occurs, in addition to timely spraying of relevant pesticides, weeds in the field should also be removed in time, and severely diseased plants should be removed to reduce the source of the disease. The main diseases in the rosette stage of cabbage are downy mildew and soft rot. Prevention methods: one is to control humidity to prevent downy mildew and soft rot; the other is to find the disease and apply medicine at the right time to control the development of the disease.

2 Pest control

Pests are less likely to occur during the growth of autumn cabbage. In the process of controlling cabbage pests and diseases, it is necessary to prevent and control summer pests in advance. If there are cabbage caterpillars and Spodoptera litura, pyrethroid pesticides can be used. In the process of preventing and controlling cabbage pests and diseases, you should know the situation in advance, reduce the pest time, and choose chemical agents reasonably.