Nowadays, it is the best time for broccoli seedling raising. Now we will introduce the management techniques of broccoli seedlings in autumn as follows: 1. Seedling management 1. Seed-to-embryo unearthing stage: It is mainly to provide sufficient moisture and suitable temperature conditions. The sowing in autumn takes a cool shed to cool the seedlings. After sowing, pour enough water and cover with straw or shade net moisturizing. Due to the high temperature in the autumn sowing, it is necessary to spray water once every morning and evening to keep the soil moist. Generally 3 days after sowing, shoots can be gradually sprouted. When 30% of the seed germs are exposed on the soil surface, cover is removed. 2, cotyledons appear to the first piece of true leaf exposed phase: should properly control the moisture and reduce the temperature to prevent the formation of tall seedlings. 3, true leaves exposed to the seedling stage: If the planting is too dense, it should be time seedlings, will be too crowded or poorly growing weak seedlings removed, and appropriate to strengthen the light, ventilation and cooling, to prevent seedlings and damping-off disease occurred. Second, seedlings (planting) 15 days after the general sowing, when the seedlings grow to 2-3 true leaves when the sub-seedling (pre-planting). One day prior to seedling, the nursery bed was first irrigated to reduce rooting when raising seedlings. After the seedlings are lifted, the seedlings are transplanted to the seedbed by 6-8 cm square. Before transplanting, use a finger or a round stick to hold a small hole in the middle of each soil on the seedbed for the seedling hole. Planting should be shallow, and the seedlings should be sealed with fine dry soil around the seedlings. The best conditions to move directly into the nutrition cup or tray, planting a seedling per cup. Planting should be carried out in the evening, while transplanting seedlings, while watering, while the shade, the watering should be sufficient penetration, so that the root system and the soil in close contact to promote the slow seedlings. The cups of the nutrition cups are not planted, but they need to be seeded in order to cultivate strong seedlings and seedlings. Usually, the seedlings are planted twice and the last seedlings per cup. After the sub-seedling take a shade net sunscreen cooling and rain. Third, after the seedling management and management of the key: the seedlings should be controlled to warm, moisturizing before the seedlings, in order to slow the early seedlings; seedlings should be improved to light, nutrition and other conditions before the seedlings, and appropriate hardening before planting, prevention Appetite or disease to nurture strong seedlings. In hot weather, you need to cool the shade and sprinkle water once a day. To prevent leggy after easing the seedlings, change to watering once a day. After 3 days of rejuvenation or the 3rd true leaf stage, thin human feces or 2% urea solution should be poured to promote seedling growth. One week before colonization, one more dung or 2% aqueous urea solution was poured for the purpose of restoring the growth of the seedlings after colonization. If Miao is long, it is necessary to reduce the amount of water spray and enhance ventilation. The common pests and diseases at the seedling stage are damping-off disease, gray mold, hanging filaments, cabbage caterpillars, and yellow song strips. In order to prevent the occurrence of pests and diseases, insecticides and fungicides are sprayed 2-3 times at the seedling stage, spraying pesticides. It can be arranged 3 days before seedling (or 2nd leaf leaf stage), 5 days after leafing (or 4th leaf leaf stage), and 3 days before planting. The fungicide can be used 75% chlorothalonil WP 600 times or 50% carbendazim WP 600 times, insecticide can be used 48% Lost 1000 times or Bt emulsion 1000 times and so on. Found pest control timely spraying control, damping-off disease can be 75% chlorothalonil WP 600 times or 50% carbendazim WP 600 times and other spray control, gray mold available 50% fast-king 2000-2200 The spraying of 5% or 5% seawater with 1500 times liquid can prevent and control the spraying of filariasis by 5% rigidity 3000 times solution or 1% insecticidal 3000 times solution, etc. during the peak period from egg hatching to 2nd instar larvae spraying. Bt emulsion can be used 1000 times, or speed kill Xiao Ding 1500-4000 times liquid and other spray control, yellow stripe jump can be used 90% Bataan 1000-2000 times or 48% of the Lothian 1000 times spray. Fourth, to prevent seedlings seedlings susceptible seedlings leggy, to prevent seedlings effective method: 1, sowing should not be too dense, so as not to seedlings after the seedlings crowded, emergence of tall seedlings. 2, timely remove the ground cover. 3, and time seedlings, planting and colonization. After seedling emergence and time seedlings, the seedlings should generally be 2-3 times. When seedlings with two leaves and one heart should be divided into seedlings (planting), the density of the implants should be controlled at 120-150 plants per square meter. It is advisable to use seedlings in the nutrition cups for the conditions. 4. Strengthen ventilation and light transmission, reduce temperature and temperature, and control overgrowth of seedlings. 5, reasonable management of fertilizer and water. The allocation of nutrient soil should pay attention to the amount of phosphorus and potassium fertilizers, control the amount of nitrogen fertilizer, and control watering. 6, timely sparse seedlings, when there is overcrowding, seedlings should be properly moved to separate the size of the seedlings, increase the vegetative growth area of ​​the individual plant. China Agricultural Network Editor
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