Cabbage planting techniques

Cabbage is a strong winter crop. The transformation from vegetative growth to reproductive growth requires strict environmental conditions, and seedlings are required to grow to a certain size before they can accept low temperature induction. Vernalization can be completed after 50 Murray at 12 °C for 90 days. With regard to photoperiod, the varieties of pointed and flat head are not very strict, while the varieties of ballpoint pen are more strict in long sunshine. After entering the reproductive growth stage, it generally goes through bolting stage, flowering stage and fruiting stage. The flowering time is 30m / m for 40 days. The result takes 40 murals for 50 days.

? 1. Cabbage planting time

Cabbage has strong adaptability, both cold and heat-resistant, and can be planted in open field in spring, summer and autumn in northern China. The alpine areas of Northeast, Northwest and North China are more than spring and summer seedling raising, summer planting and autumn harvest, long growth period and large leaf bulbs, which is the main producing area of Chinese cabbage. Some cities in North China, Northeast and Northwest China are mainly planted in spring and autumn, and multiple cropping can also be carried out. Winter and spring seedlings, spring planting and summer harvest are called summer cabbages; summer seedlings, autumn planting, autumn and winter harvest are called autumn cabbages.

? 2. Seedling raising techniques of cabbage

Cabbage is planted by seedling and transplanting. Spring cabbage is mostly precociously planted in cold areas such as Northeast, Northwest and Inner Mongolia, usually raising seedlings in the greenhouse in 2mo-March, and the seedling period is 60-80 days. There are two methods of raising seedlings in North China: one is to raise seedlings in sunny beds from mid-December to early January, and the other is to plant seedlings in sunny beds from mid-December to early January. Second, the seedlings were raised in the plastic greenhouse in February, and the seedling period was 40-50 days; the autumn cabbage was raised in 6-7 months, and the seedling period was generally 35-40 days; and the summer cabbage was raised in 4-May, and the seedling period was 30-40 days.

? 3. Fertilizer and Water Management of Cabbage

Cabbage needs to be watered slowly after planting, and because the temperature is low, ploughing and loosening soil should be done in time after watering in order to preserve soil moisture and improve soil temperature and promote the recovery and growth of root system. Entering the rosette stage, the plant should form a strong assimilation organ, absorb more water and fertilizer, apply nitrogen fertilizer 15--20kg per mu, and fully supply water to promote the growth of leaf bulb. After the leaf ball is formed, watering should be controlled to prevent the sky from breaking, which is conducive to storage.

After the cabbage survived, the first topdressing was carried out, with 10% of human and animal manure per mu and 600-800 kg per mu. After the stall period, before the ball, the mid-term topdressing times, the concentration of topdressing is 30-40% 1500 kg or so, topdressing is mainly human manure, pig fertilizer, etc., can add a little nitrogen fertilizer, generally add 0.5 kg of urea every 100 kg.

During the whole growth period, chemical fertilizer should only be added less than 2 times so as not to affect the quality. In the case of high temperature, sunny and sunny for a long time without rain, corresponding measures can be taken to carry out water watering or irrigation of wet seedlings to resist drought. Irrigation is carried out in the evening on a sunny day, and the remaining water in the ditch is discharged immediately after filling the ditch surface, so as not to cause retting roots and affect the growth. In addition, the topdressing of spring cabbage is different from that of Qiukan blue. In the case of the same basic fertilizer, spring cabbage is generally watered for drought protection in winter, but it should not be watered too much, as long as the seedlings grow well and there is no shortage of water.

After the beginning of spring, spring cabbage grows rapidly, at this time, it is appropriate to fertilize 2-3 times with about 40% concentration of heavy fertilizer, once when the interplant leaves grow all over the soil, called "sealing row", and 1-2 times before and in the middle of heading. About 1500 kilograms of human feces and urine are applied per mu.