Seedling raising technique of Brassica napus L.

Chinese cabbage, also known as Chinese cabbage, which feeds on tender bolts, belongs to a variety of Chinese cabbage and is one of the vegetables often eaten by Chinese people. Seedling transplanting is mostly used in cabbage planting, which is helpful to improve yield and quality. So how to raise seedlings of Chinese cabbage? Let's get to know it.

1. Seedling preparation

First of all, the choice of soil is that the main root of Chinese cabbage is short, the fibrous root is developed, and the root system enters the soil shallowly. The requirement for the depth of soil layer is not strict, but the requirement for soil quality is higher, and the sandy loam soil with good drainage and irrigation and rich organic matter is the best. In terms of mating selection, different types of Chinese cabbage have strict requirements for sowing time, and should choose different seasons for sowing without mating. Early-maturing varieties are sown in May-September, middle-maturing varieties are sown in September-October or April-May, and late-maturing varieties are sown from November to March of the following year. If the sowing time is too early, it will lead to the phenomenon of small plant type, small leaves, slender bolting, poor quality and low yield, while sowing too late will lead to non-bolting or slow bolting, leaf growth is too lush, and reduce the commodity value.

2. Sowing method

Direct seeding cultivation sows seeds directly in the field, without transplanting seedlings, only seedlings are transferred twice, seedlings are replenished once, and a certain density is maintained until harvesting. This method saves time and effort, and can be harvested early, but the quality is low, the land utilization rate is low, and the amount of seed is large. On the other hand, seedling transplanting is to raise seedlings on the seedling bed for 20-25, and then transplant to the field when the seedlings are molded into large and small leaves, this method takes up a short time, can improve the land utilization rate, and the seedlings grow neatly, bolting neatly, the harvest time is concentrated, and the quality of Chinese cabbage is good. It can also save the amount of seeds, but it is time-consuming and laborious, and the technical requirements are high.

3. Spraying and weeding

Weeds do great harm to Chinese cabbage. Herbicides can be used to eliminate weeds, save costs and increase the yield of Chinese cabbage. Spraying can wet the surface of the border after sowing or before transplanting. After spraying, the topsoil should not be loosened to avoid failure. The germination rate test should be carried out before sowing. First of all, the large and fresh seeds are selected, the germination rate is high, the germination energy is good, and the seedlings are strong. After ensuring the seed germination rate, sowing and raising seedlings can be carried out.

4. Sowing and raising seedlings

Before sowing, it is necessary to pour water to make the soil moist, and then sow the seeds evenly on the border surface. After sowing, cover with straw or plant ash, burning soil, and then sprinkle water, so that the seeds can be in close contact with the soil. Sowing in the high temperature period is easy to cause overgrowth, which can be sowed properly, while it can be sowed in autumn and winter. Generally, it can sprout after sowing for 1-2 days, and the temperature in winter is low, and the budding time is poor, so it can be accelerated before sowing, shorten the seedling stage, keep the soil after emergence, and water once in the morning, in the evening and in the evening during drought. Watering should be paid attention to, and the water point should be fine so as not to wash out the seedlings. Cake fertilizer can be applied 10-15 days after budding, and then fertilized every 5 days, about 3 times at seedling stage. The first interseedling was carried out when the seedlings grew 1-2 true leaves, the overdense seedlings, diseased seedlings and tall seedlings were removed, and the second seedlings were carried out when 3-4 true leaves were grown, combined with supplementary seedlings to make the plant grow neatly.

The above is the introduction of cabbage seedling technology, hope to help you, want to know more related knowledge, please pay attention to us.