1 Cultivation time
In the spring, cultivation is generally conducted in the greenhouse at the end of January and planted in open field at the end of March.
2 Suitable for planting
The main varieties that are suitable for cultivation in the spring are Zigan No.1, Zaohong, Hongmu and Tehong No.1.
3 Soil preparation
Purple cabbage has strong absorption capacity. It is necessary to deepen the land and make it 1 to 1.2 meters wide after the leveling. Apply 5,000 kg of organic fertilizer, 25-30 kg of phosphate fertilizer, 30-40 kg of urea and 20-30 kg of potash per 667 square meters. The amount of calcium in the purple cabbage plants is second only to nitrogen. If the calcium deficiency causes dry heartburn, it is also necessary to supplement part of the calcium fertilizer.
4 Sowing seedlings
Purple cabbage is generally cultivated by transplanting seedlings. Seedlings are sowed at the time of sowing, and the amount of seeds is 50 to 100 grams per 667 square meters. After emergence, the cotyledonary period temperature is controlled at 15 to 20Â°C, and the true leaf period is controlled at 18 to 22Â°C. It gradually approaches the outside temperature 5-7 days before planting. Spring sowing of purple cabbage was planted in open field at the end of March and early April. Water planting helps increase the temperature and ease seedlings. The spacing of early-maturing cultivars is 50 centimeters and 50 centimeters, 2500 to 2600 vines per 667 square meters, and the mid-maturing cultivars are 59 centimeters and 60 centimeters, and 2,200 667 square meters.
5 Field Management
The growth period of purple cabbage can be divided into seedling stage, lotus sitting stage and ball stage.
5,1 Seedling management Before planting, the seedbed should be thoroughly irrigated with bottom water. The seedlings should be subdivided and planted so as not to damage the root. In addition, try not to water the seedbed.
5,2 Rosette period management After pouring 1~2 times of larvae, it enters the seedling stage, and cultivating 2-4 times during this period. The first cultivator should be deep and comprehensive in order to facilitate the growth and promote root growth; the middle cultivator should be shallow in the middle of the rosette, and the soil should be combined with soil to promote the growth of the outer short-minus stems, which is beneficial to the ball-bearing. Early maturing varieties seedlings 10 to 15 days; late maturing varieties seedlings need 30 days. To start the balling at the end of the rosette, a lot of water should be poured.
5,3 Ball-ball management During this period, the ball is growing fast and requires a large amount of water. Generally, the water will be watered on the ground until it is harvested.
When the leaf ball reaches a fairly tight real time, it can be harvested. Cut off the root pedicle at the time of harvest, remove the outer leaves and damaged leaves so that the leaves are clean and free from dirt. For early-maturing varieties, they can be harvested in batches as long as they have a certain degree of firmness. Can be closed within 1 month. The mid- and late-maturing varieties generally have to wait for the leaf ball length to reach the maximum and the tightest real-time concentration 1 to 2 times. The 667 square meters of early maturing varieties can reach 2000 kilograms, and 667 square meters of medium and late mature varieties can reach 3,000 to 4,000 kilograms.
7 Pest Control
7,1 The disease should prevent the occurrence of damping-off during the seedling stage, and the water should be properly controlled to allow more ventilation and light transmission. During the ball stage, it mainly prevents the occurrence of soft rot, especially in summer and autumn. It is necessary to prevent water accumulation and to remove diseased plants in time. Spraying with 100-150 mg/kg of agricultural streptomycin has a certain control effect. At the same time, it is prone to burning edge during the balling period, and soil moisture should be maintained to facilitate the absorption of calcium. In addition, spraying some calcium on the foliage also has a certain control effect.
Mainly locusts and cabbage caterpillars. Aphid control methods are timely removal of weeds, stubble and dead leaves. Can be used 40% dimethoate emulsifiable concentrate, 50% evasion fog powder and rapid killing diced and other agents. The prevention and treatment of cabbage caterpillar is to avoid continuous cropping or interplanting with the same family of vegetables. Chemical control can be controlled with 2.5% Kung Fu EC or bt-781 EC.
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