The sowing time of kale is usually from mid July to early August. If it is sown too early, the old leaves will turn yellow in the later period of growth, which increases the difficulty of management and prolongs the management period. If the sowing time is too late, it is easy to cause that the crown diameter of the leaves can not reach the required specification when they are out of the nursery.
Sowing can be done in the open. Generally, it can be used as hole or border plate to raise seedlings. In order to drain water in July and August, the seedbed needs to be about 20 cm higher than the ground to form a high bed.
Before sowing, it is necessary to set up the arch scaffold and prepare the plastic film, which can be covered in time in case of heavy rain, so as to avoid reducing the emergence rate due to rain washing. 40% peat soil and 60% perlite can be used as the substrate of seedling, and carbofuran can be used to disinfect the soil and reduce the occurrence of diseases and insect pests. Before sowing, it is necessary to spray water through the soil first, and then directly spread seeds on it. The coverage depth is appropriate to cover no seeds. After sowing, it is not necessary to water again. In 15 - 20 ℃ temperature, about a week time can sprout
Transplanting is usually carried out when the seedlings grow 4-5 true leaves, and transplanting is carried out in the middle and late November, and generally needs 3-5 transplants. Collards can be transplanted with bare roots. When planting, peeling off the outer layer of the old leaves not only highlights the color of the heart leaves, but also reduces the water consumption, so that the plant can recover as soon as possible.
Kale is fond of fertilizer, so it needs more nitrogen fertilizer in the early growth period, so it needs more topdressing to ensure sufficient nutrient supply. When planting, prepare enough base fertilizer. About one week after seedling transplantation, topdressing can be started. In autumn, the climate turns cool, the growth speed is accelerated, and the nutrient absorption is increased. At this time, we should also pay attention to providing sufficient water and fertilizer. Stop applying nitrogen when the plant starts to change color. The outer leaves were yellow and shed.
