At present, the autumn sowing Chinese cabbage enters the rosette stage from the seedling stage (with 2 to 3 leaves sequence rings to the period before the package). The outside temperature gradually decreased, the growth rate of Chinese cabbage accelerated, the formation of outer leaves, the differentiation of spherules, and the lower bar and thickening of roots were all in this period. The author summarized the following management methods for the reference of farmers' friends.
One, weeding weeding
In the rosette period, tillage and weeding are still performed before unsealed ridges, but they should be carried out when the leaves are relatively soft in sunny days so as not to damage the leaves. At the same time, the root system should be protected during cultivating and the weeds should be promptly removed. To master the principle of "deep sewers and shallow squats", the depth of ridge back rakes should not exceed 4 cm, and the ditch depth of ploughing can reach 8 to 10 cm. After ridge closure, cultivators are no longer cultivated.
Second, water and fertilizer management
1. Moisture Management: The rosette period is a period in which a large number of roots of Chinese cabbage grow and a sudden increase in the growth of leaves. It is also the basic period for the formation of leafballs, and therefore it is also a time when more water and fertilizer are needed. At this time, it is a time when downy mildew is in danger. The occurrence of downy mildew requires higher temperatures and humidity. Although the temperature of exposed ground cannot be controlled, the humidity can be controlled by watering. Therefore, the watering during the lotus period should be properly controlled so that the soil will be dry and wet. In the middle of the rosette period, a large amount of water can be poured, then deep cultivating, and then controlling the water for 10 to 15 days.
2. Fertilization management: During the rosette period, 15 to 20 kg of ammonium sulfate can be applied per acre, and 1,000 kg of high-quality organic fertilizer can also be topdressed. Top dressing should not be applied to the surface and should be buried to increase fertilizer efficiency.
Third, pest control
1. Diseases: The major diseases of Chinese cabbage are viral disease, downy mildew, and soft rot. Viruses were sprayed with 20% virus A500-fold spray; 40% alponid 300-fold or 70% mancozeb 500-fold spray was used to control downy mildew; 150 ml/l streptomycin sulfate spray was used to control soft rot disease.
2. Insect pests: The main pests of Chinese cabbage are aphids, cabbage caterpillars, and earthworms. The aphids were sprayed with 40% dimethoate emulsion at 2500 times; the earthworms were sprayed with 50% malathion 1000 times; and the cabbage beetles were sprayed with 10.8% caesar 14,000 times.
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